The 2013 results are now available from the Youth Risk Behavior Surveillance System, a massive survey of teenagers in 9th through 12th grade taken by the CDC every two years. Results are available in a lengthy report and in an interactive database allowing comparisons between years, among states, and by demographic characteristic.
Here is the percentage of high school students by grade who have ever had sexual intercourse in 2013 (and in 1993). Note the statistically significant decline in each grade.
9th grade: 30.0% (37.7)
10th grade: 41.4% (46.1)
11th grade: 54.1% (57.5)
12th grade: 64.1% (68.3)
Source: CDC, Youth Risk Behavior Surveillance System
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