The number of immigrants arrested after attempting to enter the United States from Mexico has dropped to the lowest levels in more than 50 months, part of a continued decline since the White House took decisive action to deter illegal migration in June.

Approximately 47,000 illegal immigrants were apprehended by U.S. Border Patrol agents at the southern border in November, down from 55,000 to 61,000 each month since June, according to Border Patrol statistics published Friday evening.

Throughout most of President Joe Biden’s tenure, illegal border arrests ranged from 150,000 to 250,000 per month.

The decline continued through June, when Biden took executive action and implemented a new rule to turn away people at the border rather than release thousands who were crossing daily into the interior of the country to await court dates years down the road.

In total, 47,536 illegal immigrants were arrested last month, including 5,778 unaccompanied children, 29,332 single adults, and 12,426 who arrived with a family member.

The precipitous drop in illegal immigration since last December is a notable change of course for President Joe Biden, who has overseen a historic border crisis. The monthly number of arrests has slowly decreased over the past six months, dropping from 250,000 last December to 83,000 in June.

Border Patrol’s overseeing agency, U.S. Customs and Border Protection, has attributed several actions to the drop, as well as bilateral talks with Mexican government officials last December that have led to improved cooperation between countries in dealing with illegal immigration.

In May, CBP said it was ramping up removal flights for the return of illegal immigrants to their countries once they reach the southern border.

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The number of arrests indicates how many immigrants are attempting to cross since not all people crossing are apprehended.

In February, Republicans impeached Homeland Security Secretary Alejandro Mayorkas over his management of the southern border and have long-touted Trump’s border policies as the only way to return illegal immigration levels to previous norms.