In 2008, union members accounted for 12.4 percent of employed wage and salary workers, up from 12.1 percent a year earlier, the U.S. Department of Labor's Bureau of Labor Statistics reported. The number of workers belonging to a union rose by 428,000 to 16.1 million. In 1983, the first year for which comparable union data are available, the union membership rate was 20.1 percent, and there were 17.7 million union workers.