The global recession that began in 2007 caused overall migration flows and temporary work visas to drop significantly. Data from the US and Mexico showed immigration rates falling sharply from 2006 to 2010. While a mass return of Mexican immigrants did not occur, the number of illegal border crossings into the US decreased substantially. Unemployment rates increased more for foreign-born workers compared to native populations across many countries, with the exception of Mexican and Central American immigrants in the US whose unemployment rates improved.