In 2009, a total of 409,840 infants were born to 15−19 year olds, for a live birth rate of 39.1 per 1,000 women in this age group. Nearly two-thirds of births to women younger than age 18 and more than half of those among 18−19 year olds are unintended. The US teen birth rate fell by more than one-third from 1991 through 2005, but then increased by 5 percent over two consecutive years. Data for 2008 and 2009, however, indicate that the long-term downward trend has resumed. The U.S. teen pregnancy and birth, sexually transmitted diseases (STDs), and abortion rates are substantially higher than those of other western industrialized nations.