Источник: Бюро переписи Соединенных Штатов, Census 2000 Summary File 1; 1990 Census of Population, General Population Characteristics, United States (1990 CP11).
资料来源：U. S. Census Bureau, Census 2000 Summary File 1; 1990 Census of Population, General Population Characteristics, United States (1990 CP-1-1)。