U.S. immigration authorities deported 227,038 undocumented immigrants in fiscal year 2015, which ended last September, according to figures published Tuesday by the Department of Homeland Security.

During fiscal year 2015, which ended Sept. 30, U.S. Immigration and Customs Enforcement carried out 235,413 migratory operations, of which 227,038 were deportations and 8,375 were undocumented persons who voluntarily returned to their own countries.

The number of deportations executed by ICE this fiscal year was less than in the previous period, when 315,943 individuals were deported.

According to the report, undocumented immigrants from 181 countries returned to their countries of origin, most of them to Mexico (146,132), followed by Guatemala (33,249), El Salvador (21,920), and Honduras (20,309).

Ninety-one percent of the 235,413 deportations and voluntary departures handled by ICE were individuals with criminal records.

The report also includes figures from Customs and Border Protection, which in fiscal year 2015 arrested 337,117 individuals, fewer than in the previous year, when the CBP carried out 486,651 arrests.

The figures published Tuesday show a decline both in arrests and in deportations compared with fiscal year 2014, when an unprecedented immigration crisis broke out on the southwestern border due to the arrival of thousands of unaccompanied children, most of them from Central America.