In a new report, the Urban Institute think tank writes that in 2012, there were only 948 births per 1,000 women in their 20s, “by far the slowest pace of any generation of young women in U.S. history.” In 2007, the rate was 1,118 births per 1,000. The decline in births was largest among Hispanic women, at 26 percent, followed by black women, at 14 percent, and an 11 percent drop for white women…

For white women, though, the story was very different: “81 percent of the decrease in fertility is attributable to declining marriage rates.” (Granted, white women were less likely to be single mothers to begin with.) All the single ladies of countless Internet essays are, indeed, staying unhitched—and they’re not having kids as a result.

The report authors say they don’t know whether Millennial women will eventually catch up in childbearing like women who lived through past recessions did.