Migration Information Source - Frequently Requested Statistics on Immigrants and Immigration in the United States
Data from the Pew Hispanic Center show that the annual flow of unauthorized immigrants from Mexico has declined from about 500,000 per year between March 2000 and March 2005, to about 325,000 per year between March 2005 and March 2007, and to about 150,000 per year between March 2007 and March 2009. Between 2008 and 2009, the unauthorized immigrant population from Mexico appears to have declined, although the change is not statistically meaningful. This finding is reinforced by US Border Patrol apprehensions data and Mexican government surveys. However, the change in the unauthorized immigrant population from other regions of Latin America (excluding Mexico) did definitively decline in 2009 from 2.5 to 2.2 million people. The unauthorized immigrant population from other regions of the world beyond Latin America has remained stable between 2.0 and 2.3 million for much of the last decade.