In 2007, 12.1% of U.S. wage & salary workers were members of these, down from 20% in 1983
Historical Tables: Union Membership, Coverage, Density and ... All Wage 
& Salary Workers ... 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 
2012 2013 2014 2015 ... Union Membership and Coverage Database from the 
CPS ... estimates by state, detailed industry, and detailed occupation begin in 
1983;... [DOC] [TLE] Wage Stagnation in Nine Charts | Economic Policy Institute [PAR] Jan 6, 2015 ...