The United States population gained immigrants at the slowest pace in a decade last year, according to an analysis of new census data, a notable slowdown that experts said was quite likely linked to a more restrictive approach by the Trump administration.

The net increase of immigrants in the American population dropped to about 200,000 people in 2018, a decline of more than 70 percent from the year before, according to William Frey, chief demographer at the Brookings Institution, who conducted the analysis.

“It’s remarkable,” said David Bier, an immigration expert at the Cato Institute, of the 2018 numbers. “This is something that really hasn’t happened since the Great Recession. This should be very concerning to the administration that its policies are scaring people away.”