In 2011, women working full-time and year-round earned 82 percent of what their male counterparts earned.
The data can be found in the book Women in the Labor Force: A Databook. This report presents historical and recent labor force and earnings data for women and men from the Current Population Survey (CPS), a national monthly survey of approximately 60,000 households conducted by the U.S. Census Bureau for the U.S. Bureau of Labor Statistics.