From the AP, "Positive Trends Recorded in U.S. Data on Teenagers," July 12th:

The teenage birth rate in 2005, the report said, was 21 per 1,000 young women ages 15 to 17 — an all-time low. The rate in 1991 was 39 births per 1,000 teenagers.

Actually, Ezra Klein manages to provide just a smidgen of ambiguity (though I suspect even he would approve of this outcome).