For the first time in almost a decade, women outnumber men in the U.S. workforce. In December, women just barely surpassed men at 50.04% of the labor force, providing 109,000 more workers in all industries, excluding farmworkers and the self-employed.

Ariane Hegewisch, program director of employment and earnings at the Institute for Women’s Policy Research, told the Wall Street Journal that one explanation for the shift is the expansion of female-dominated industries.