Robert Peterson
Analyst · Goldman Sachs
Yes. Sure, Neil. I guess let me answer your question by relaying where we are today. So as you indicated from our comments, the conditions are still very strong in our vinyls and in our caustic soda business. We don't -- from our, first of all, sales, the Russian-Ukraine impact is really the escalation of prices in Europe and in Asia, which is impacting their chlor-alkali operations and chlorine derivative production and leading them to not only reduce operating rates but also increase prices accordingly. That's benefiting both sides of the business because of that.
And so -- but not only that, domestically, the business remains very strong on the vinyl side of the business. And so we would estimate year-to-date March -- operating rates through March, these lag a bit but were reported by industry at 81.6% year-to-date, which is not as high as you might think it might be. But there's been a lot of controls in that due to the outages that occurred in the industry during the first quarter, which is pretty typical. But domestic demand in the first quarter was up about 10% versus last year. And in fact, domestic demand in March for the U.S. was the highest single month for domestic demand in over a decade, just reflecting that pent-up demand for construction.
And despite what is relatively, based on historical value, high prices for PVC, the demand is still there, and it's being pulled right through the building products. So that's great for the business. Exports are about 7.5% higher than they were this time last -- through March last year, reflecting the fact that there's opportunities to sell PVC internationally. In some ways, the PVC is exporting U.S. gas and ethylene overseas and the places that are being impacted by the higher prices or availability. So that's all -- it's very constructive for the business.
And then we see that demand being very resilient certainly through the first half of the year, a favorable housing sector, et cetera, and the export business being open for as long as it's available simply because of the U.S. advantage on gas, ethylene and energy, et cetera, versus rest of the world. So PVC feels constructive. Obviously, interest rates raising can impact housing starts, et cetera, and demand on that business. And so that's one of those uncertainties. We're not seeing anything that would suggest it's falling off, bringing fractures in the strength of PVC.
We're sitting here in the month of May and watching the news, like everyone else is, regarding the Fed getting more hawkish towards interest rates can have a corollary impact on housing starts and demand at some point. And so we're just a little bit less clear on the trajectory in the second half of the year. So you see a little more cautious outlook for the business on that side.
On the caustic side of things, it's been a -- we don't get operating rates anymore as an industry because of the amount of people that participate in it, and so -- but we would estimate rates are somewhere in the low 80s. But all producers had scheduled and unscheduled downtime, the majors, during the first part of the year so far. There's been several downstream consumers that have had issues and production issues. And we're obviously dealing with some railroad logistics issues as an industry and other industries right now.
And so -- but the core sectors, just like home construction, durable goods, transport, et cetera, they're all very strong right now. The improvement in travel and customer spending is still there. And obviously, just like in the PVC business, we're taking advantage of the fact that with the energy advantage in the U.S. versus the rest of the world right now from a pricing standpoint, despite being high here, it's nowhere near as high as it is in Europe and Asia, which opens up opportunities and will lead some consumers of our products to produce products here versus overseas and then export those products. And so again, similar to the PVC business, the caustic business in the second half of the year -- I think it's very strong through the first half of the year. It's just a little less clear trajectory in the second half of the year only because of those overhanging potential impacts to the economy and associated GDP, which typically drives a big part of the business.
And so I wouldn't say that we're pessimistic towards the second half of the year. If you look at the guidance range we gave and look at what we're doing for the second quarter and look at Slide 33, which had a historical view of chemicals performance, the second quarter guidance alone would have been a great year by many standards for many years prior to '21 and '22. And then if we look at the second half of the year, even if we reach our guidance midyear, you're talking ranges, it will also be close to $1 billion on the high end of our range. Certainly, if things are more constructive, we're on the high end of the range. And I think that's the feeling that we have right now.
We'll get more clarity. We're really in the zone right now where we're trying to understand what might be the impacts of rising interest rates in the business. But all the demand factors today are still very constructive for supply/demand. And the longer that supply/demand balance remains tight on the 2 sides of the business, the higher we're going to go towards the high end of that guidance, and we'll potentially revise that guidance at some point midyear obviously, once we see how the second quarter turns out. But our guidance that we provided for the year beyond the Q2 guidance just takes into consideration that uncertainty we have in the second half of the year just because of what's going on not only in the U.S. but globally in the economy.