Union membership in 2012 declined to 11.3 percent of U.S. wage and salary workers last year, down from 11.8 percent in 2011.
The number of wage and salary workers belonging to unions, 14.4 million, also declined over the year.
In addition, the reported noted that in 2012, among full-time wage and salary workers, union members had median weekly earnings of $943, while those who were not union members had median weekly earnings of $742.
Source: Kansas City Star. Read full article. (link)