BEIJING - China's statistical authorities said Wednesday that more people migrated within the country last year.

According to a report issued by the National Bureau of Statistics, 271 million people did not live in the places of their registered residence for more than six months last year, up 9.77 million from 2010.

China has adopted measures to reform the household registration system to facilitate internal migration and make migrant workers eligible for more social services.

Meanwhile, China's labor force dropped in 2011, the first time in 10 years, due to low fertility rates and a quickly aging population. Laborers aged between 15 to 64 accounted for 74.4 percent of the country's total population, down 0.1 percentage point from 2010, the bureau said in the report.