Via Population Reference Bureau
By Heidi Worley
From the article:
(June 2014) Births to U.S. teenage girls ages 15 to 17 have decreased by 63 percent over the past 20 years (from 39 per 1,000 teens in 1991 to 14 per 1,000 teens in 2012), according to the latest statistics released by the Centers for Disease Control and Prevention (CDC). With an 8 percent decline between 2011 and 2012, the birth rate for teens ages 15 to 17 is at its lowest level ever recorded in the United States.
Vital Signs: Births to Teens Aged 15-17 Years — United States, 1991-2012, from the Morbidity and Mortality Weekly Report
Births: Final Data for 2012, National Vital Statistics Report 62(9) (PDF)