Arizona has led the nation in the decline in the teen birth rate from 2007 to 2010.
That's according to the National Center for Health Statistics.
Nationally, the rate of teenaged girls having babies dropped 9 percent to 34 girls per thousand.
But in Arizona the rate has dropped 29 percent.
At 42 teenage births per thousand, Arizona still has one of the highest teen birthrates in the country.
New Federal data show the nation's teen birthrate is at historic lows.
And Arizona saw the largest decline in the country from 2007 to 2010.
In those 4 years, Arizona's birthrate for girls, aged 15 to 19, fell 29 percent.
Brady Hamilton put the report together for the National Center for Health Statistics.
But he says the states decline in teen birthrates is only part of the story.
"Arizona was fairly high, it wasn't the highest, but it was fairly high, so 29% still leaves room for more decline," said Hamilton.