As of 2005, Colorado has an estimated population of 4,665,177, which is an increase of 63,356, or 1.4%, from the last year and an increase of 363,162, or 8.4%, since the year 2000. This has a natural increase since the last census of 205,321 people (that is 353,091 births minus 147,770 deaths) and an increase because of migration of 159,957 people into the state. Immigration from outside the United States makes a net increase of 112,217 people, and migration within the country made a net increase of 47,740 people.