Government costs for the paid time that federal employees spend on union activities in 2011 grew by nearly 12 percent over the previous year, reaching $156 million, according to a report released Friday by the Office of Personnel Management.

“Official time,” as the hours are known, rose during that period by nearly 10 percent.

The average number of official hours per employee also increased 8 percent to 2.82 hours for each worker in 2011, up from 2.61 in 2010.

The OPM credited the increase to a jump in the number of union-represented employees, increased collective bargaining in several large agencies, growing use of labor-management forums and greater emphasis “on accurately documenting official time compared to previous years.”

The number of non-Postal Service federal employees rose by about 1.4 percent in 2011 compared to the previous year, totaling 1.2 million workers, according to the agency’s report.

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