Thanks, Daniel, and good morning, everybody. Let me start with the 2018 financial 2.4results highlights. Revenues reached ARS 435.8 billion, a 72.4 % increase compared to 2017, while adjusted EBITDA increased by almost 100%. However, our adjusted recurring EBITDA, which excludes the profit from the revaluation of our investment in YPS Luz, amounted to ARS 121.5 billion, expanding our recurrent EBITDA margin up to 28%, versus 26% of 2017 despite the challenging scenario we just discussed. Total CapEx of ARS 95.4 billion, resulting in an increase of 64.4% compared to 2017 but was lower in dollar terms as the devaluation of the local currency allotted some investments in pesos as we'll explain later on. This CapEx amount was exceeded by cash flow from operations, we reached a total of ARS 125 billion in 2018, consistently with our financial discipline commitment. The good news of the year is that our P1 reserves increased by 16.2% in 2018, boosted mainly by our shale and gas recovery operations. Our reserve replacement ratio for 2018 reached 178%. Total hydrocarbon production was down 4.5%, and we'll be going to much more detail on this number. We'll explain all these numbers in detail as we go through the presentation. Moving on to reserves in 2018, we were able to achieve a 178% reserve replacement ratio, reaching almost 1.1 billion barrels of oil equivalent of crude reserves, which represent a 16.2% increase compared to 2017. Net incorporation of reserves amounted to 344 million barrels of oil equivalent per day, of which 254 came from liquids and 90 came from natural gas. This increase in reserves was obtained both in unconventional and conventional fields. It is worth mentioning that our shale reserves already represent 19% of total reserves. Let's move now to the analysis of the 2018 production. Total hydrocarbon production dropped 4.5% vis-a-vis 2017 to 530,000 barrels of oil equivalent per day. Let's look at this with more detail. Crude oil production in 2018 remained stable compared to a year ago at 227,000 barrels of oil per day. The good news here is that our unconventional production growth is now offsetting the conventional production decline, and we expect this trend to continue this year and beyond, providing the source for oil production growth. Regarding gas, the story here is a little bit different. As we discussed in previous quarters, during 2018, the good results obtained by YPF and by other operators developed in shale gas resulted in a situation where gas supply is above gas demand, and therefore, we faced a situation where we had to curtail some gas production during certain times of the year, mainly during the mild weather period. This resulted in a 4.6% decrease in our natural gas production compared to last year, reaching 42 million cubic meters per day. Now if we hadn't had to curtail our natural gas production, our total gas production would have been flat, and we would have produced approximately 2.5 million cubic meters per day of additional gas in the year. This situation will undoubtedly result in the medium and long term as Argentina is gradually shifting from gas importer to gas exporter, but it poses a clear challenge for the short term. However, we have already made our first step activating some short-term levers in terms of generating more demand, like exporting gas to Chile and installing a small-scale LNG barge that has already arrived at the port of Bahia Blanca, and we commence operations in the third quarter of this year, allowing us to export up to 2.5 million cubic meters per day. In the meantime, we will focus more on oil production and on gas and the optionality of our acreage position allow us to do so. NGL production decreased 23% to a total of 38,800 barrels per day as a consequence of the scheduled maintenance stoppage in our affiliate company, Mega and its main client, and of course, the lower natural gas production in the period we just explained. When we break down the sources of our production, we can observe that shale production contributed with 21 south and additional BOEs per day in the year, while tight production showed a decrease of 6,200 BOEs per day, mainly related to a lower production of natural gas as explained before. Finally, it is worth mentioning that by the end of 2017, we sold our participation in the Cerro Bandera conventional block, which represented an average of 2,300 BOE per day. Moving now to unconventionals. Net shale production of the year reached almost 58,000 BOE per day, showing an increase of 57% compared to a year ago. But this upward trend continues, as by the end of the year, our net shale production increased up to 72,000 BOE per day, almost 25% above the average of the year, proving, once again, where the growth is coming from. Now if we add to our net shale production, the 88,000 BOE per day of tight gas and liquids of total – our total unconventional production of 146,000 BOEs per day, represent now almost 28% of our total production. In terms of our activity as operator, during 2018, we produced 99,000 BOE per day, and we connected a total of 80 new shale horizontal wells, raising the total number to 676 producing shale wells. In relation to cost in our shale operations, the development cost in Loma Campana continues in the good trend, reaching during 2018 an average of $11.4 per BOE while operating expenses continued to improve too, staying now at $6 per BOE area. Based on these excellent results, we decided with our partner Chevron to launch, what we call, Loma Campana Phase 2 development, which includes more rigs, more wells and more infrastructure. Now on the left hand of this slide, we can see that in addition to the continuous decrease in development cost and OpEx that we have already mentioned, every year, we have been consistently increasing well productivity as well as expected ultimate well recovery. On the right hand of the slide, we are showing current Loma Campana type curve for 2,500 meter horizontal well length for different zone, and we can see that the actual wells are aligned with those type curves that have been upscaled from the 1,500 type curves, which, in turn, are calibrated with the much larger number of existing wells. We will continue looking at different ways of optimizing our operations, including increasing the length of our laterals, reducing the frac spacing, using high-density completion, increasing the number of wells per pad, using soluble plugs, testing new well designs, using spudder rig combined with high-spec rig and increasing the proppant plant efficiency. We are committed to replicate and multiply Loma Campana excellent results by expanding this oil development hub size, and we are taking very concrete actions to achieve that objective. First, we launched, what we call, Loma Campana development Phase 2. This Phase 2 includes increase in the drilling phase by adding new rigs, expanding the treatment facilities and ensuring we have the necessary evacuation route for this new oil. Loma Campana will be progressively increasing the production level every year until reaching a production plateau of 100,000 barrels of oil per day and 6 million cubic meters per day of associated gas by 2023. With the knowledge we have today, we expect maintaining this production plateau level for more than 10 years. 2019 activities in Loma Campana will consist in drilling with four dedicated rigs plus one spudder rig, completing around 40 new long horizontal wells and reaching a total gross production of around 48,000 BOE per day. We have also launched the expansion of Loma Campana treatment facilities from the current level of 50,000 barrels per day to 100,000 barrels per day to much-expected production levels, and we will be soon put in service our new 888-kilometer oil pipeline going from Loma Campana towards the main oil evacuation pipeline. The initial capacity of this pipeline is 157,000 barrels per day and can be upgraded to 220,000. Cost structure is already finished, and we are currently filling it with oil. 2019 budget for Loma Campana will be approximately $670 million contributed half-and-half by partners. The second step to expand this oil hub is coming from La Amarga Chica block, which is a joint venture of fifty-fifty with Petronas. During 2018, we finalized a successful three-year production pilot, and based on the excellent results, we jointly decided to move ahead with the development. During 2017, we will use their four dedicated rigs to drill 39 new long horizontal wells, and the goal is reaching a production of 20,000 BOE per day by the end of this year. 2019 CapEx is estimated at $550 million for this field, contributing half-and-half by partners. Similarly to Loma Campana, La Amarga Chica will be progressively increasing the production level every year, until reaching a plateau of 70,000 barrels of oil per day and 1.2 million cubic meters per day of associated gas by 2023. With the knowledge we have today, we expect maintaining this production plateau level for approximately 10 years. The first step in expanding this shale oil hub is coming from Bandurria Sur block, also very near to Loma Campana, where we have been doing the risk in activities with our partner Schlumberger. Based on the good results and the knowledge we already have from neighboring blocks also operated by us, we decided to move ahead and accelerate the development of the 1,000 part of the block, which is already the risk, adding three dedicated rigs this year to drill eight new wells in the block, while we continue, at the same time, piloting and the risking the remaining parts of the block. We will be co-investing $300 million during 2019 to increase production to 9,000 BOE per day. Although at a much more easy stage of understanding of the area and without all the risk in place, we believe this block has the potential to reach a production plateau around 60,000 barrels of oil per day and 2.4 million cubic meters of associated gas by 2023. In the lower part of the slide, we can see the expected pace of drilling and production increase for this year in these three fields. Now the said expansion does not end up with these three blocks. We have substantially high-quality acreage around them, and we are currently performing the risk in activities to select those that will be part of our next wave of developments. We will be mentioning them along this year, but to give an example, we are currently drilling and we'll be testing this year horizontal shale oil wells south of Loma La Lata. Finally, we're also focusing in expanding Vaca Muerta boundaries by drilling and testing wells in other potential oil hubs. We'll be expanding more about this activity throughout the year, but an example, we can mention that we'll be soon put into production two long horizontal and shale oil wells in Bajo del Toro block, a joint venture we have with Equinor. As Daniel explained at the beginning of the presentation, 2018 was a disruptive year for the natural gas market in Argentina, so we wanted to take – to talk more about it. Resolution 46, as it was originally interpreted, resulted in a rapid growth of shale gas production, which helped the country reducing LNG imports during the winter, but also resulted in a surplus of gas during the mild season, and as a consequence, we had to curtail production as explained before. In the chart on the left side of the screen, we can see that our natural gas production, represented by the blue shallow, reached a peak in July and then declined abruptly due to a lack of demand. These curtailments are represented in the green line of the chart. A mild weather in May resulted in lower residential demand, forcing us to curtail some production during this period too. Moving to the chart of the right, you can see that the 2018 natural gas realization price was also lower than expected. At the beginning of the year, we were expecting an average price of approximately $5 per million btu, however, we ended the year with an average price $0.50 below our expectation. This price decrease was mainly driven by lower market prices and lower subsidies. Market prices were not only affected by the strong devaluation of the year as distribution companies were not able to pass through the full impact to the financial customers, but also by the gas auctions launched by CAMMESA for power generation in the second half of the year, where the gas was abandoned. Regarding subsidies, as we mentioned before, the government announced last month that it would be providing subsidies under Resolution 46 only to the production level that was included at the time the project was approved and will not consider production above this level. In addition, we had some projects that already counted with the necessary provincial approval, but lacked the final approval from the National Secretary of Energy. Finally, the government also announced that those projects would not be included Resolution 46 and this forced us to reverse some accruals with the hit in net income of approximately $60 million, which also reduced the total amount of subsidy for the year. For 2019, we expect gas average prices of approximately $4 per million btu. In the recent auctions with distribution companies for the gas to be supplied from April 2019 to March 2020, we were able to contract good volumes at an average price of $4.6 per million btu. In summary, for the gas market, the negative side is that we have to curtail some production due to lack of demand, that prices were lower than expected and that we, finally, got less subsidies that we were expecting. The consequence of that is that we will be more selective now in terms of gas investment for growth moving forward until we will be able to generate more demand. On the positive side, the production capacity of shale gas field from Vaca Muerta has been improved, and the government is actively working towards liberalizing this market. The gas price indications we are seeing are along the lines with expectation we have for long-term shale gas developments. Moving now to our Downstream business segment. During 2018, the volume of crude oil processed in our refineries was 284,000 barrels of oil per day, 3.2% lower than 2017, mainly as a result of scheduled maintenance stoppages in our industrial complexes and lower demand of fuel oil from power generation plants as there was more of a liability of natural gas in the period. Regarding sales, total volumes were slightly above the previous year. Although demand for our main products, diesel and gasoline increased, total volumes in the local market decreased by 1% as they were negatively affected by a significant reduction in fuel oil demand and as we have just explained, well, higher exported volumes of jet fuel and LPG drove total export up by 19%. Now to provide more detail about fuel demands, on this slide, we can see on the left-hand side, how gasoline sales evolved every month compared with the previous two years and on the right-hand side, the same for diesel oil. Gasoline and diesel demand increased by 3.7% and 4.5 respectively during the year. However, as it can be observed, during the last quarter of the year, the market started to show some deterioration in response to the contraction of the economy and the slowdown in consumption with a slow recovery during December. We also experienced some transfer in demand from premium products to regular, especially in the second half of the year with lower volumes of 7.6% and 4.5% for Infinia gasoline and Infinia diesel, respectively. Market share for both products continued to be strong in 2018 and above 2017 with 56% in gasoline and 59% in diesel. Market share for our premium products, Infinia gasoline and Infinia diesel were 61.5% and 60%, respectively. As we have been showing along the year, we would like to address one more time what we have been doing in terms of prices and where we are now. The blue line in the graph represents the evolution of the blended price of our fuels in pesos since the beginning of the year 2019. We used import parity as the reference where local prices will converge. The dotted line shows the evolution of import parity, including demand the blend of domestic biofuels and the full line shows our average prices. As it shows in the graph, from April to November and despite the periodic price adjustment that we put in place every month during that period to cope with the combined steep depreciation of the peso against the U.S. dollar and the increase in international prices, we were still below the import parity. We converged by November and have remained at or slightly above import parity until the end of February. As we have mentioned, the spike in FX, coupled with an increase in international prices that happened in April, put an increasing pressure to our Downstream margins, as prices for gasoline and diesel were reduced in dollar terms. Local crude oil prices averaged $63 per barrel along the year, almost 11% below brand price as a consequence of negotiations between producers and refiner that occurred in certain times of the year and the recent export tariffs implemented by the government that reduced local crude oil prices. As a consequence, our Downstream EBITDA per refined barrel, and without considering the revaluation of inventories, decreased to $10.04 in the year, 14% below 2017, but still a healthy margin, given everything that we went through this year. Now let me focus briefly on our financial results for the full year expressed in U.S. dollars. Revenues showed a slight 1.7% increase in dollars, almost neutral in terms of fuel sales, impacted possibly by higher exports and negatively by natural gas sales. Adjusted recurring EBITDA was upward by 8.8% in dollars without considering the profit from the revaluation of YPF investment in YPF Luz. Including this effect, EBITDA was $5 billion or 24% higher. The total CapEx amounted $3.3 billion in 2018, which is a 4.3% lower compared to 2017, reduction that is mainly explained by the dilution of some peso items entering into our CapEx, driven by the currency revaluation. Upstream CapEx in the year amounted to $2.7 billion being essentially flat compared to 2017. Drilling and workover represent 70% of the Upstream CapEx, facilities 20% and exploration and other activities 10%. During 2018, we drilled and put into production a total of 395 new wells, including 148 targeting shale and tight gas formations. In Downstream, CapEx was $509 million, of which 59% was in refining, followed by logistics with a 23% share of the total, marketing 15% and finally, chemicals with a 13%. Now moving to the last quarter of the year. Revenues showed a slight reduction of almost 1% in the quarter, mainly due to lower prices for our main products, partially offset by higher exports. Regarding operating costs, lifting refining cost in dollars decreased by 70% and 26% in absolute terms, reflectively and royalties were also down by 11%. Total purchases were down by 0.2% in dollar, with a combination of higher imports of fuels and lower crude oil purchases from third-party. As a result, the adjusted EBITDA remains flat in dollar. It is important to note that this quarter's EBITDA figure was negatively affected by the valuation of inventories, whereas last year had a positive effect. The difference between quarters would have been a positive 17% if adjusted for this noncash effect. Total CapEx for the company amounted to $916 million in the fourth quarter of 2018, 6.3% lower compared to the same quarter of 2017. Now let's switch back to Argentine pesos to go over a more detailed analysis of the year. As we did in previous quarter, we are now focusing the analysis in adjusted EBITDA of our business segments instead of operated income to provide a better understanding on how each business segment contributes with a cash generation of the company, putting aside the FX impact on depreciation and amortization, which are in fact a noncash effect. Moving on to adjusted EBITDA, it has come up by 82% vis-à-vis 2017. This was mainly driven by better operating results obtained in our Upstream business segment, which showed an increase of ARS 19 billion compared to a year ago. Revenues of the segment increased by 80.5%, mainly as a result of higher crude oil and natural gas prices in pesos, while on the other hand, cash cost of this segment increased by 71.3%, well below revenue increase as lifting cost and other OpEx were partially diluted by the devaluation. The Gas & Power segment also showed better operating results of ARS 13.5 billion. Revenues increased by almost 63%, driven by higher natural gas prices in pesos of 50.7%, partially offset by a 6.2% reduction in volumes due to lower production and demand of this product as we explained before and sales from our subsidiary Metrogas, which also increased by ARS 14.5 billion, which are mainly explained by a 96% increase in prices and that during 2018 this company recorded an inflation adjustment of ARS 4.2 billion in sales as the peso is the functional currency of this company. On the other hand, it is worth remembering that from first quarter 2018, YPF Energia Electrica is no longer consolidated in the business and the results, and in 2017, this company had contributed with ARP 1.2 billion EBITDA. The Downstream segment results show a slight decrease of almost ARS 2.1 billion. This is basically explained by higher crude oil and by fuel purchases, coupled with higher imports of fuels, which are dominated in dollar. However, revenues of this business segments managed to increase by 73%, driven by a good demand of our products along the year, despite the weaker demand we started to see after September, coupled with higher prices in pesos, although lower in dollars for gasoline and diesel as explained before, then higher sales of LPG, jet fuel and petrochemical products and higher exports on higher volumes and higher international prices. It is worth mentioning that the refining cost showed an increase of only 27.3% compared to the 12 months of 2017 as the currency depreciation play an efficient role as well. In addition, during 2018, and as a consequence of lower depreciation due to higher reserves, the replacement cost came down, resulting in a negative inventory variation of ARS 1.8 billion compared to the positive ARS 3.7 billion of 2017. The cash generation during 2018 reached a total of ARS 125.1 billion, 74% above the operating cash flow of 2017. This increase of ARS 53.1 billion was mainly due to an increase in adjusted EBITDA of ARS 54.8 billion and some working capital variations that were almost offset by each other. This operating cash flow more than exceeded the ARS 88.3 billion CapEx of the period and contributed with the deleverage process. Finally, this cash generation included in the dollar-denominated sovereign bonds still held in treasury resulted in a strong cash position of ARS 57 billion at the end of 2018. As we can see in the graph on the right, we managed to fully fund our CapEx program with our own cash generation, reaching a total of ARS 36.8 billion of cumulative free cash flow during the year, covering the ARS 26.3 billion of interest payments of the year. The previously explained cash position is enough to cover our short-term debt maturities of next year. It is important to highlight that approximately $900 million of short-term debt are related to trade facilities with an average maturity of one year, which we expect to renew during the year, while the only maturity in the capital markets, the CHF 300 million come in due in September this year. Our leverage ratio stood at 1.7x net debt to recurring adjusted EBITDA, within our 2x target for the year, while the average life of the debt remains in the six years area. The average interest rate in pesos increased to 44.7%, in line with the spike in rates occurred in the second half of the year, while the average cost of our debt in dollars remained stable at 7.4%. With this, I would like to turn the presentation back to Daniel, who will provide some final remarks and guidance for the year ahead.