The U.S. birth rate fell steeply in 2020, reaching a record low for the sixth year in a row, according to a new report.

Last year, there were 55.8 births per 1,000 U.S. women ages 15 to 44, which is 4% lower than the rate in 2019, and the lowest recorded rate since the government started tracking birth rates in 1909, according to the report from the National Center for Health Statistics, which is part of the Centers for Disease Control and Prevention (CDC).