The number of people apprehended for illegally crossing the U.S.-Mexico border dropped sharply in February, which the Department of Homeland Security said is a sign of decreased traffic of illegal immigrants, and a sign that President Trump’s immigration policies are already having an effect.

Apprehensions in February were 18,762, which is lower than any of the totals seen over the last five years, according to U.S. Customs and Border Protection statistics released late Wednesday.