The number of workers in Pennsylvania who belong to unions fell to 13.5 percent last year, mirroring a nationwide trend.
In 2011, about 14.6 percent of the state workforce included union members.
Nationally, the percentage of union members slipped from 11.8 percent in 2011 to 11.3 percent, the lowest level in nearly 75 years.
Overall, according to the Pennsylvania AFL-CIO, federal numbers indicate that the state has lost about 50,000 union workers.
Two key factors are cited for the lower numbers — fewer union members working for state and local governments, and the difficulty unions have encountered organizing new locals in private business.