Brian Lane
Analyst · Adam Thalhimer
All right, Bill, thank you very much. Let me walk you through the backlog, what we're seeing in the various sectors and markets and our outlook for 2013.
Let's turn to Slide 7 and start with backlog. Backlog at the end of the fourth quarter was $618 million compared to $623 million at the end of the third quarter. Year-over-year backlog decreased $12 million due to the burn off of the large fast-paced data center project mentioned earlier. Overall, we are heading into 2013 with similar backlog levels to a year ago.
Please turn to Slide 8 and where we look at our sectors. The institutional markets, which are government, health care and education, make up 48% of the backlog. The private commercial sectors remain weak, but we continue to win our fair share of smaller and midsized projects. Larger projects are still few and far between. Although margins remain tight, we remain cautiously optimistic that activity levels in most market sectors are stable.
Let me discuss what we're seeing across the country, starting with the West. The operations in the West were the first to be impacted by the recession. Markets for operations in Southern California, Colorado and Arizona have stabilized. While we are encouraged by this, the conditions in many of the Western markets are still among the slowest in the nation. Northeast region, which includes our companies in the Upper Midwest, remain stable and in 2012, it was our most profitable region. We had strong execution and solid results from the operations in Maine, Massachusetts, Michigan, New York, Ohio and Northern Maryland. The vast majority of the operating companies in this region have stable backlog going into next year by doing a superb job of making the most of a tough environment. The Southeast is experienced -- is experiencing improved demand in some markets but still has pockets of weakness, such as Florida and Atlanta.
Our operations in the Mid-Atlantic experienced the downturn later in the cycle and continue to face a weak pricing environment. I was in a number of these operations over the past few weeks. Our folks there and in the West do a terrific job working in these tough market conditions.
Let's now review our revenue mix. Please turn to Slide 9. Fuel service, which is maintenance and repair, was 16% of revenue in 2012 compared to 17% in 2011. Service, repair and retrofit, again, exceeded 50% of our 2012 revenue. These activities continue to provide us with the majority of our earnings and cash flow, as we prepare for a recovery in Construction. Our Service & Maintenance base is steady. We have consistently invested in our Service business for the past several years and we plan to continue these investments in 2013.
Finally, let me describe our outlook for this year and our general approach to the overall market. The nonresidential construction markets remain tough. Demand remains mixed and pricing is still very competitive. We are entering 2013 with a very similar set of backlog, demand and pricing conditions, so we expect that weakness in the underlying environment for nonresidential activity to continue to affect our results and our industry in 2013, with overall activity remaining at subdued levels.
Our focus for 2013 is execution, cost discipline and service performance. Based on our backlog and the weak economic conditions for our industry, we expect continued profitability during 2013, but we expect that lower levels of profitability, some which are those that we experienced in 2012, will continue in 2013.
So what do we expect beyond 2013? Those of you who follow us closely, know that we have continued to invest in our business during this recession. We plan to increase these investments in 2013 because we believe it's time for a renewed emphasis on growth. We are hopeful that incremental demand will appear for 2014, but whether or not that is the case, we believe that after more than 3 years of unprecedented weakness, many or most of the markets we operated in have adapted to ambient levels of demand. We plan to begin to leverage our excellent workforce and business to achieve growth in the coming years. The benefit of our approach is not likely to appear in 2013, especially since we have tough revenue comparisons in the first and second quarters. However, our focus in the coming years will be profitable growth and we are optimistic about the future.
Finally, and again, I would like to thank all of our 6,700-plus team members for their efforts. I will now turn it back over to Kim for questions. Thank you.