Unintended pregnancy rate in U.S. is high, but falling

A big part of the reason for the decline, at least so far, is the "pretty significant increase in women using long-acting contraceptive methods like the (intrauterine device) in recent periods," Finer said. These methods, such as the levonorgestrel and copper IUD and birth control implants, are associated with failure rates of less than 1%, while the failure rates of birth control pills and condoms are about 9% and 18%, respectively...
http://www.cnn.com/2016/03/02/health/unintended-pregnancy-rate/