The number of undocumented Filipino immigrants around the world increased by 52 percent last year, the majority of them in the United States and Malaysia, reports ABS-CBN News, citing data from the Commission on Filipinos Overseas (CFO). Irregular immigrants to Malaysia registered the biggest rate of increase at 124 percent in 2011, from the 200,000 in 2010. Malaysia now has 447,590 irregular Filipino immigrants. The United States followed with a 67 prcent increase in irregular workers, from 156,000 in 2010 to 260,000 in 2011. Singapore had 49,400 irregular Filipino migrants in 2011.