The San Diego region gained 4,000 construction jobs from March 2015 to March 2016, according to an analysis of federal employment data by the Associated General Contractors of America.

The group said construction employment increased 6 percent over the 12-month period, from 66,400 to 70,400 jobs.

Nationally, construction employment increased in 244 out of 358 metropolitan area, according to the data, a sign of recovery after the years-long economic downturn. The association said 70 percent of construction firms reported they are struggling to find qualified workers.

Anaheim-Santa Ana-Irvine added the most construction jobs during the past year, 11,900, a 14 percent increase.