 Teen pregnancies—defined as pregnancies in women under the age of 20, regardless of marital status—in the United States decreased 28% between 1990 and 2000, from 117 pregnancies per every 1,000 teens to 84 per 1,000.The 2008 rate was a record low and represented a 42% decline from the peak rate of 117 per 1,000, which occurred in 1990.From 2009 to 2010, the teen pregnancy rate dropped 9%, the biggest one year drop since the 1940s.