There are two basic sources on abortion incidence in the United States:
• The U.S. Centers for Disease Control (CDC) publishes yearly, but relies on voluntary reports from state health departments (and New York City, W ashington, D.C.). It has been missing data from California, New Hampshire, and at least one other state since 1998.
• The Guttmacher Institute (GI) contacts abortion clinics directly for data but does not survey every year.
• Because it surveys clinics directly and includes data from all fifty states, most researchers believe Guttmacher’s numbers to be more reliable, though Guttmacher still believes there may be as much as a 5% undercount in its most recent figures.
Both the CDC and Guttmacher show significant recent drops and even larger drops over the last 25 years.
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