The Department of Homeland Security’s 2011 Yearbook of Immigration Statistics was released last month, including figures that show that the number of illegal aliens apprehended in the United States was the lowest in 40 years.

The report shows (page 91, table 33) that in fiscal year 2011, the number of illegal aliens apprehended was 641,633 – at that time the lowest total apprehensions since 1972 when the number of illegal aliens apprehended was 505,949.

The report shows that the number of illegal aliens apprehended has steadily decreased over the course of the Obama administration, from 869,857 in fiscal year 2009 to 641,633 in fiscal year 2011.

The table includes the following totals for fiscal years 2008-2011: