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New figures Monday show there were about 210,000 undocumented immigrants in the Phoenix metro area in 2016, the most recent estimates available. That compares with about 400,000 in 2007, though there is a margin for error.

Only the New York City and Los Angeles areas had a larger drop, though both decreases were smaller on a percentage basis.

It’s not just Phoenix reflecting the decline.

ÃÛèÖÖ±²¥â€™s unauthorized immigrant population dropped about 25 percent, from 50,000 to 35,000.

The latest estimate for Yuma is 15,000 immigrants without documents, which may be a drop of about 5,000, though with the smaller numbers Pew reports the margin of error makes the accuracy less clear.

For the Prescott area, Pew reports that the number of unauthorized immigrants in 2016 may have been anywhere from 25 to 50 percent smaller than the 10,000 living there in 2007.

Pew researcher Jeff Passel said the reductions may partly be due to the change in immigration patterns from other countries.

“We know there’s been a significant drop in Mexican unauthorized immigrants over that decade,� he said.

“And ÃÛèÖÖ±²¥â€™s unauthorized immigrant population is largely Mexicans,â€� Passel continued. “The fact that many fewer Mexican immigrants are coming into the country and more are leaving than coming is a big factor behind this.â€�

Some research suggests policies adopted by ÃÛèÖÖ±²¥ lawmakers also may be a factor, Passel said.

For example, Pia Orrenius, vice president and senior economist with the Federal Reserve Bank in Dallas, looked at the requirement for employers here to use the federal E-Verify system.

That requirement is part of a 2007 law, formally known as the Legal ÃÛèÖÖ±²¥ Worker Act.

It allows a state judge to suspend all business licenses of any firm found guilty of knowingly hiring those not in the country legally. A second offense within three years puts the company out of business.

Another part of that law spells out that employers must use the online system to determine whether new employees are legally entitled to work here.

There is no penalty for failing to make the checks. But those who use E-Verify have a legal defense against charges they knowingly broke the law.

The U.S. Supreme Court, in a 5-3 decision in 2011, upheld the ÃÛèÖÖ±²¥ law, rejecting arguments by the business community, Hispanic-rights organizations and the Obama administration that it infringes on the exclusive right of the federal government to regulate immigration.

“The work that we found on E-Verify found that it actually has a significant impact on the wages of likely undocumented workers,� Orrenius said, with a specific finding of an 8 percent reduction in hourly wages.

But Orrenius said there also are larger issues at work, including an improved economy in Mexico and the changing demographics there.

Orrenius said the age of most migrants for economic purposes is between 18 and 24. As the number of people in that age segment decreases, she said, there are fewer to emigrate to the United States.

She had no specific studies on the effect that ÃÛèÖÖ±²¥â€™s SB 1070 had in reducing the number of unauthorized immigrants living in the state.

That 2010 law contained several provisions aimed at illegal immigration. While some were struck down by federal courts, the U.S. Supreme Court did give the go-ahead for ÃÛèÖÖ±²¥ to require that police ask the immigration status of those they stop if they have reason to suspect they are undocumented.

The Pew study also finds mixed results across the country.

Overall, the report says the unauthorized population in the United States dropped from about 12.2 million in 2007 to 10.7 million in 2016.

While most of the metro areas showed a decline or no significant change, there were a few areas with increases.

Most notable is the Washington, D.C., area where the number of people not in this country legally is estimated to have increased by 100,000 between 2007 and 2016, to 425,000.