HOUSTON — The national total fertility rate was 1.7655 in 2017, down from 1.8205 in 2016 and 1.8435 in 2015, the Centers for Disease Control and Prevention reports.

The population needs to have a fertility rate of 2,100 births per 1,000 women to reproduce itself, reports Fortune.

Fortune makes the argument that if the U.S. “wants a stable population, it either needs more babies or more immigration.”

District of Columbia had a low TFR of 1.4210 while South Dakota was higher than the average with 2.2275.

Hispanic women in the United States have a higher total fertility rate, averaging 2.0065 nationwide.

America is not alone in the declining fertility rate, however. Globally it has declined since 1960, reaching a 2.439 in 2016.