Maddow-Zimet I and Kost K, Pregnancies, Births and Abortions in the United States, 1973–2017: National and State Trends by Age, New York: Guttmacher Institute, 2021, https://www.guttmacher.org/report/pregnancies-births-abortions-in-united-states-1973-2017.
A complete data set of estimates, along with accompanying documentation, is available at https://osf.io/kthnf/.
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