Jeffrey Passel, a demographer at the Pew Hispanic Centre, estimates that the number of illegal immigrants in America fell by 500,000 between 2007 and 2008.

皮尤西班牙裔研究中心(Pew Hispanic Centre)的人口学家杰弗里?帕赛尔(JeffreyPassel)预计2007至2008年间美国非法移民的数量下降了50万人。