( CNN ) -- A bipartisan group of senators on Monday presented a legislative plan for comprehensive immigration reform one day before President Barack Obama was to offer his ideas . Those efforts , and possibly more to come , signal the largest movement in years aimed at overhauling the nation 's immigration system . Here 's a look at immigration and naturalization , by the numbers : . 11.5 million : Estimated number of undocumented immigrants in the United States , as of 2011 , the most recent year available as reported by the Pew Hispanic Center . 1.91 million : Estimated number of resident non-immigrant population as of January 2011 . This number includes students , temporary workers , and diplomats and their families . 14 : Percentage of the resident non-immigrant population that lives in California . 482,300 : Immigrant visas issued by the U.S. State Department in Fiscal Year 2012 . 8 : U.S. senators behind the bipartisan immigration reform plan : Democrats Chuck Schumer of New York , Dick Durbin of Illinois , Robert Menendez of New Jersey , and Michael Bennet of Colorado ; and Republicans John McCain of Arizona , Lindsey Graham of South Carolina , Marco Rubio of Florida , and Jeff Flake of Arizona . 65 : Percentage of those gaining LPR status that had a family relationship with a U.S. citizen or someone who already has legal , permanent status . 23.1 : Millions of foreign-born workers in the U.S. labor force , as of 2010 . 114 : Bills enacted by 41 state legislatures in the first half of 2012 that addressed legal immigrants , migrants , and seasonal workers . 56,384 : People admitted to the United States as refugees in 2011 . 409,849 : Individuals removed by the Immigration and Customs Enforcement ( ICE ) in Fiscal Year 2012 . 55 : Percentage of those removed who were convicted criminals . 327,000 : Immigrants apprehended by Customs and Border Patrol in Fiscal Year 2011 . 20 : States that require the use of `` E-verify , '' which allows businesses to determine whether potential employees have the right to live and work in the U.S. as of November 2012 . 2,955 : Migrants intercepted by the U.S. Coast Guard in fiscal year 2012 . 5 months : Length of time it takes for U.S . Citizenship and Immigration Services to process an application for naturalization . 100 : Civics questions on the naturalization test . State legislation related to immigration . 2005 : 300 bills introduced ; 39 laws enacted ; 6 vetoed . 2006 : 570 bills introduced ; 72 laws enacted ; 6 vetoed ; and 12 resolutions adopted . 2007 : 1,562 bills introduced ; 178 laws enacted ; 12 vetoed ; and 50 resolutions adopted . 2008 : 1,305 bills introduced ; 139 laws enacted ; 3 vetoed ; and 64 resolutions adopted . 2009 : More than 1,500 bills introduced ; 202 laws enacted ; 20 vetoed ; and 131 resolutions adopted . 2010 : More than 1,400 bills introduced ; 208 laws enacted ; 10 vetoed ; and 138 resolutions adopted . 2011 : 1,607 bills introduced ; 197 laws enacted ; 15 vetoed ; and 109 resolutions adopted . 2012 : 948 bills introduced ; 111 laws enacted ; 2 vetoed ; and 92 resolutions adopted ( as of June 30 , 2012 )
There were 2 million undocumented immigrants in the United States in 2011 . 14 % of U.S. total non - immigrant population that lived in poverty in 2011 . It takes about 18 months on average to file an application for naturalization .