The abortion rate in the United States fell to its lowest level since the historic Roe v. Wade Supreme Court decision legalized abortion nationwide, a new report finds.

The report by the Guttmacher Institute, a research group that supports legalized abortion, puts the rate at 14.6 abortions per 1,000 women of childbearing age (ages 15-44) in 2014. That's the lowest recorded rate since the Roe decision in 1973. The abortion rate has been declining for decades — down from a peak of 29.3 in 1980 and 1981.

The report also finds that in 2013, the total number of abortions nationwide fell below 1 million for the first time since the mid-1970s. In 2014 — the most recent year with data available — the number fell a bit more, to 926,200. The overall number had peaked at more than 1.6 million abortions in 1990, according to Guttmacher.

Perhaps not surprisingly, given the longstanding controversy around abortion policy, the meaning of the report is somewhat in dispute.

Planned Parenthood President Cecile Richards said efforts to help women get better access to contraception are paying off. She points in particular to recent improvements in the rate of unintended pregnancies, and a historically low teen pregnancy rate.

"It shows that we're finally doing a better job of helping women get access to birth control that's affordable and that's high-quality," Richards said.

As President-elect Donald Trump prepares to take office, Richards is gearing up for a fight over federal funding for women's health services provided by Planned Parenthood. Republican leaders in Congress have vowed to work with Trump to repeal the Affordable Care Act, which requires contraceptive coverage for many women.

"We shouldn't go backwards on access to birth control," Richards said.

Some anti-abortion groups, meanwhile, argue the Guttmacher report shows new state restrictions on abortion are working. Kristi Hamrick, a spokeswoman for Americans United for Life, said she has her doubts about the Guttmacher report — since the data come from surveys of abortion providers — but accepts the overall conclusion. She emphasized the impact of new regulations on clinics and laws requiring women seeking abortions to get an ultrasound, which she said are having a "real, measurable impact on abortion."

"These have been game-changers, and we see the abortion rate dropping in response," Hamrick said.

Hamrick said she believes abortion numbers are also falling in part because public sentiment is turning against abortion — although surveys by the Pew Research Center show opinions on abortion have been largely stable over the past two decades. The Gallup polling firm has found Americans largely divided on abortion in recent decades, with a majority labeling themselves "pro-choice" in a 2015 survey.

The Guttmacher report says abortion restrictions do appear to be a factor in the declining numbers in some states. But principal research scientist Rachel Jones, lead author of the report, said that's not the whole story. She noted that abortion declined in almost every state, and "having fewer clinics didn't always translate into having fewer abortions."

A more important driver of the declining abortion rate, Jones said, appears to be improved access to contraception, particularly long-acting birth control options like IUDs. She noted that women in the United States have been using the highly effective devices in growing numbers for more than a decade, and said the declining birthrate suggests more women are preventing unwanted pregnancies.

"Abortion is going down, and births aren't going up," Jones said.

Chuck Donovan, president of the anti-abortion Charlotte Lozier Institute, called the drop in the abortion rate "good news," regardless of one's political point of view. He said there are likely a number of factors behind the decline.

"By and large, this is encouraging for a country that obviously remains deeply divided and discomfited about the benefits of abortion to the public," Donovan said.

But when it comes to abortion, common ground is hard to find. The Guttmacher Institute's Jones said the data may signal that some women who want abortions can't get access.

"If there are women in these highly restrictive states who want abortions but can't get them because there aren't any clinics that they can get to, and that's why abortion's going down, that's not a good thing," Jones said. "But we think the story that's going on in a lot of situations, in a lot of states, is that fewer women are having unintended pregnancies and in turn fewer abortions, and that is actually a good story."

Copyright NPR 2020.