Australia's contemporary immigration program has two components: a program for skilled and family migrants and a humanitarian program for refugees and asylum seekers. By 2010, the post-war immigration program had received more than 6.5 million migrants from every continent. The population tripled in the six decades to around 21 million in 2010, including people originating from 200 countries. More than 43 per cent of Australians were either born overseas or have one parent who was born overseas. The population is highly urbanized, with more than 75% of Australians living in urban centers, largely along the coast though there has been increased incentive to decentralize the population, concentrating it into developed regional or rural areas.