This shows a 15% drop in pregnancies from 2008 to 2010. There is a huge decline in adolescent pregnancy for the nation as a whole. The cause of these declines are from abstaining from sex or better use of contraceptives.[26] Birth rates among younger teens ages 15–17 have also fallen faster – dropping by 50%, compared with a 39% decline among older teens ages 18 and 19.[27] Researchers have concluded that these declines stem from improvement in use of contraceptives.[26]