The U.S. construction industry added 37,000 net new jobs in March, according analysis of Labor Department data by the Associated Builders and Contractors (ABC).

Year-over-year, construction employment expanded by 301,000 net new jobs, the industry’s largest annual increase since May 2015. The sector added 20,000 net new jobs in February (revised upward from 19,000) and 18,000 net new jobs in January.

The nonresidential segment added 12,700 jobs on a monthly basis in March after adding only 1,300 net new positions in February (revised downward from 2,800). Nonresidential specialty trade contractors added 6,500 positions in March after losing jobs in the first two months of the year.

“The headline job growth number tells us that construction remains one of the U.S. economy’s leading economic drivers,” says ABC chief economist Anirban Basu. “While the broader economic recovery remains in place, construction accounts for a disproportionate share of that recovery. Many other aspects of the recovery remain at least somewhat unsatisfying, including surprisingly soft wage growth, weak corporate profits and sluggishness in business investment. However, demand for labor remains high, including in a number of key nonresidential construction segments.”

The construction industry unemployment rate remained unchanged at 8.7 percent in March, but remains almost a full percentage point lower than at the same time one year ago.

Nonresidential building construction employment expanded by 6,200 jobs in March and is up by 20,800 jobs or 2.9 percent on a year-over-year basis. Residential building construction employment grew by 1,800 jobs in March and is up by 30,800 jobs or 4.5 percent on a year-ago basis.

Employment in the nonresidential specialty trade contractors category is up by 86,500 jobs or 3.8 percent from the same time one year ago. Residential specialty trade contractors added 11,600 net new jobs in March and have added 135,200 jobs or 7.7 percent since March 2015.