They should be:
UNION MEMBERS — 2010
In 2010, the union membership rate—the percent of wage and salary workers who were
members of a union—was 11.9 percent, down from 12.3 percent a year earlier, the U.S.
Bureau of Labor Statistics reported today. The number of wage and salary workers be-
longing to unions declined by 612,000 to 14.7 million. In 1983, the first year for
which comparable union data are available, the union membership rate was 20.1 per-
cent, and there were 17.7 million union workers.
http://www.bls.gov/news.release/union2.nr0.htm
This sounds like from the book It Can’t Happen Here..