"This Office of Immigration Statistics Annual Report presents information on the apprehension, detention, return, and removal of foreign nationals during 2007. DHS apprehended nearly 961,000 foreign nationals. Nearly 89 percent were natives of Mexico. The annual number of foreign nationals apprehended by the Border Patrol decreased by 19 percent compared to 2006. ICE detained approximately 311,000 foreign nationals. More than 319,000 aliens were removed from the United States-the fifth consecutive record high. The leading countries of origin of those removed were Mexico (65 percent), Honduras (9 percent) and Guatemala (8 percent). More than 891,000 other foreign nationals accepted an offer to return to their home countries without a removal order. Expedited removals accounted for 106,200 or 33 percent of all removals. DHS removed 99,900 known criminal aliens from the United States."
United States Department of Homeland Security: http://www.dhs.gov/