This year saw the most people in immigration detention since 2001

Immigration authorities have detained a record number of undocumented immigrants this past year, according to data obtained from Immigration and Customs Enforcement.

ICE held an average of more than 42,000 people in custody each day throughout fiscal year 2018. The previous record high since ICE began tracking the data in 2001 was just over 38,000 last year.

Over the past year, the monthly average numbers fluctuated between a low of 39,192 last October and a high of 44,699 in June.

The agency did not provide a monthly average for October 2018, the first month of the new fiscal year.