Each year, almost 750,000 girls aged 15–19 become pregnant. Two-thirds of all teen pregnancies occur among the oldest teens (18–21-year-olds). Of them, 82% are unplanned, accounting for about 20% of all unintended pregnancies annually. Of pregnancies among 15–19-year-olds girls in 2008, 59% ended in birth, 26% in abortion, and the rest in miscarriage. Overall, 68 pregnancies occurred per 1,000 girls aged 15–19 in 2008. Nearly 7% of 15–19-year-old girls become pregnant each year. Pregnancies are much less common among girls younger than 15. In 2008, 6.6 pregnancies occurred per 1,000 teens aged 14 or younger. In other words, fewer than 1% of teens younger than 15 become pregnant each year. Stillborn and newborn deaths are 50% higher for teen moms than women aged 20–29, and are more likely to have a low birth weight.