In 2010, the Ghana Immigration Service reported a large number of economic migrants and Illegal immigrants inhabiting Ghana: 14.6% (or 3.1 million) of Ghana's 2010 population (predominantly Nigerians, Burkinabe citizens, Togolese citizens, and Malian citizens). In 1969, under the "Ghana Aliens Compliance Order" (GACO) enacted by the Prime Minister of Ghana Kofi Abrefa Busia; Government of Ghana with BGU (Border Guard Unit) deported over 3,000,000 aliens and illegal immigrants in three months as they made up 20% of the population at the time. In 2013, there was a mass deportation of illegal miners, more than 4,000 of them Chinese nationals.