As of 2015, Wyoming had an estimated population of 586,107, which was an increase of 1,954, or 0.29%, from the prior year and an increase of 22,481, or 3.99%, since the 2010 census. This includes a natural increase since the last census of 12,165 (33,704 births minus 21,539 deaths) and an increase from net migration of 4,035 into the state. Immigration resulted in a net increase of 2,264 and migration within the country produced a net increase of 1,771. In 2004, the foreign-born population was 11,000 (2.2%). In 2005, total births in Wyoming were 7,231 (birth rate of 14.04 per thousand). Sparsely populated, Wyoming is the least populous state of the United States. Wyoming has the second-lowest population density in the country (behind Alaska) and is the sparsest-populated of the 48 contiguous states. It is one of only two states (Vermont) with a population smaller than that of the nation's capital.