Women in the Labor Force: A Databook, 2008 ed.
"The past several decades have been marked by notable changes in women’s labor force activities. Since the 1970s, women’s labor force participation has risen substantially, particularly among women with children, and a larger share of women work full time and year round than ever before. In addition, women have increasingly attained higher levels of education: among women ages 25 to 64 who are in the labor force, the proportion with a college degree more than tripled from 1970 to 2007. Women’s earnings as a proportion of men’s also have grown over time. In 1979, women
working full time earned 62 percent of what men did; in 2007, women’s earnings were 80 percent of men’s.

This report presents historical and current labor force and earnings data for women and men from the Current Population Survey (CPS). The CPS is a national monthly survey of approximately 60,000 households conducted by the U.S. Census Bureau for the U.S. Bureau of Labor Statistics. Unless otherwise noted, data are annual averages from the CPS. Users should note that the comparisons of earnings in this report are on a broad level and do not control for many factors that can be significant in explaining earnings differences. For a detailed description of the source of the data and an explanation of concepts and definitions used, see the
Technical Note at the end of this report."