Construction firms added jobs in 31 states from December to January, according to an analysis of Labor Department data by the Associated General Contractors of America. On a year-over-year basis, 43 states and the District of Columbia added jobs from January 2014 to January 2015.

“Most of the country experienced a welcome rebound in construction employment last year,” says Ken Simonson, the association’s chief economist. “Yet it is unclear how public sector demand and new regulatory requirements will overshadow relatively robust private-sector demand.”

Texas added more new construction jobs (49,600 jobs, 7.9 percent) between January 2014 and January 2015 than any other state, and North Dakota (13.4 percent, 4,300 jobs) added the highest percentage of new construction jobs during the past year.

Seven states shed construction jobs during the past 12 months, with Mississippi losing the highest percentage and total number of jobs (-6,600 jobs, -12.7 percent).

Thirty-one states added construction jobs between December and January. California (11,700 jobs, 1.7 percent) added the most jobs, while Arkansas (4.9 percent, 2,300 jobs) had the highest percentage increase for the month.

Nineteen states lost construction jobs for the month, while construction employment was unchanged in the District of Columbia. Louisiana (-4,100 jobs, -2.8 percent) lost the highest percentage and the most construction jobs between December and January.