WASHINGTON – JANUARY 22: Pro-choice advocates participate in protest in front of the U.S. Supreme Court building January 22, 2010 in Washington, DC. Activists from across the nation gathered to commemorate the 37th anniversary of the Roe v. Wade Supreme Court decision, which decriminalized abortion in all fifty states. (Photo by Mark Wilson/Getty Images)Abortion protestors (FIUsm)

A recent study released by the Guttmacher Institute found that the U.S. abortion rate has fallen to its lowest rate since 1973.

The study claims that in 2014, the abortion rate is 14.6 abortions per ever 1K women of childbearing age (defined as ages 15-44). The rate peaked at 29.3 abortions per 1K women in 1980-1981. In 2013, the abortion rate “fell below 1M for the first time since the 1970s.”

Number of abortions per 1,000 women ages 15-44 (The Guttmacher Institute/NPR)

The study also found that 12% of clinics had at least one patient who tried to self-induce her abortion. There was no correlation between the closing of abortion clinics and more restrictive abortion laws by state. In areas where more abortion clinics opened, there was not a higher abortion rate.

There appears to be a substitution effect at work, with other birth control methods taking the place of abortion. Most notable is that of the intrauterine device (IUD), which has gained in usage over the past several years.

But why 1973? 1973 was the seminal year where the U.S. Supreme Court handed down their decision on Roe v. Wade, which legalized abortion. It’s a good sign that women are using more birth control methods and not having to rely on abortion to get rid of unintended pregnancies.