The number of migrant workers in China more than doubled from 2000 to 2013 - from 121 million to 245 million, and ballooned from 9.6 percent of the country's total population to 18 percent in 2013, 21st Century Business Herald reported on Sunday.

Anhui province is the largest exporter of migrant workers in China, and a lot of them are heading to Guangdong province, which has the largest migrant population.

Most migrants come from six provinces - Sichuan, Hunan, Henan, Guizhou in Central and Southwest China, and Jiangxi and Anhui provinces in East China. About 71 percent of the cross-province movers in 2013 started in those six provinces, according to the report, quoting sources at the National Health and Family Planning Commission, which released a report in November.