Construction firms added jobs in 40 states and the District of Columbia between May 2014 and May 2015, according to analysis of Labor Department data by the Associated General Contractors of America (AGC). Employment increased in 28 states and D.C. between April and May.

“Construction has outpaced the overall economy in adding workers nationally but the mix of states with construction job gains keeps changing,” says Ken Simonson, AGC’s chief economist. “The top 10 states for job gains from April to May had previously lagged in adding construction workers, while energy-producing and other states that had record construction employment a few months ago have slipped.”

California added the most construction jobs (46,600 jobs, 6.9 percent) over the last 12 months, followed by Florida (28,200 jobs, 7.2 percent), Texas (20,300 jobs, 3.1 percent), Washington (18,100 jobs, 11.6 percent) and North Carolina (15,600 jobs, 8.8 percent). Idaho (11.8 percent, 4,200 jobs) added the highest percentage of new construction jobs during the past year, followed by Washington, Michigan (10.7 percent, 15,100 jobs) and North Carolina.

Ten states shed construction jobs since May 2014, with West Virginia (-12.3 percent, -4,200 jobs) losing the highest percentage. Other states that lost a high percentage of jobs for the year included Mississippi (-7.2 percent, -3,600 jobs) and Rhode Island (-5.4 percent, -900 jobs). The largest job losses occurred in Ohio (-2.2 percent, -4,300 jobs), West Virginia and Mississippi.

Construction employment increased by 4.3 percent from April to May in Connecticut (2,400 jobs) and New Hampshire (1,000 jobs). Those states were followed by New York (4.2 percent, 14,200 jobs) and Vermont (4.1 percent, 600 jobs). New York added the largest number of jobs for the month, followed by California (6,100, 0.9 percent) and Maryland (2.9 percent, 4,500 jobs).

According to AGC, states that set recent construction employment records include South Dakota, where employment shrank by 3.0 percent (700 jobs) in May, North Dakota (-2.4 percent, -900 jobs), Iowa (-1.8 percent, -1,400 jobs), Louisiana (-1.7 percent, -2,400 jobs) and Oklahoma (-1.0 percent, -800 jobs). The steepest monthly losses occurred in Wyoming (-4.1 percent, -1,000 jobs) and Wisconsin (-3.6 percent, -4,000 jobs). Wisconsin had the largest number of construction job losses from April to May, followed by Louisiana.