In 1870, about half of Nevada's population consisted of foreign immigrants, among them Chinese, Italians, Swiss, British, Irish, Germans, and French Canadians. Though their origins were diverse, their numbers were few—no more than 21,000 in all. Not until the 1940s did migrants come in large volume. Between 1940 and 1980, Nevada gained a total of 507,000 residents through migration, equal to 63% of the 1980 population; there was an additional net gain from migration of 233,000 during the 1980s, accounting for 75% of the net population increase. Between 1990 and 1998, Nevada had net gains of 397,000 in domestic migration and 45,000 in international migration. In 1998, the state admitted 6,106 foreign immigrants, of whom 2,881 were from Mexico. Between 1990 and 1998, the state's overall population grew 45.4%, making it the fastest growing state in the nation. In the period 1995–2000, 466,123 people moved into the state and 232,189 moved out, for a net gain of 233,934, of whom 22,189 were age 65 or over.