Story highlights The survey attributes it to two contrasting developments

There doesn't seem to be a correlation between clinics and abortion rates

(CNN) The abortion rate in the US has fallen to its lowest level since Roe v. Wade legalized the procedure, a new report finds.

The report, by the Guttmacher Institute , found the rate has declined to 14.6 abortions per 1,000 women of, what is considered, childbearing age (that's 15 to 44). That's the lowest rate recorded since the landmark Supreme Court decision in 1973.

Another notable finding: the annual number of abortions in the US has dropped to under 1 million for the first time since the mid-1970s. It reached its peak of more than 1.6 million abortions in 1990.

The survey, "Abortion Incidence and Service Availability in the United States, 2014, " was authored by Rachel Jones and Jenna Jerman for the institute, which supports legalized abortion.

And even though the authors didn't directly look at reasons for the decline, they attribute it to two contrasting developments:

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