Fortune: Minority women might be the fastest-growing group of entrepreneurs in the U.S., yet businesses owned by women and minorities bring in far less revenue than firms with male or non-minority owners, according to the Pew Research Center’s analysis of U.S. Census Bureau data. In 2012, when the data was collected, women owned 36.2 percent of businesses, but earned only 11.3 percent of the revenue. While there are undoubtedly occupational differences between men and women, the disparity continues when you zero in on female-dominated industries. For example, women owned 64.5 percent of health care and social assistance companies in 2012, but received just 19.9 percent of that industry’s $703.5 billion in revenues.