U.S. Census Bureau
访问日期： 21 二月, 2018
Notes: - Starting in 2012, data were created using population controls based on Census 2010 data. - Starting in 2001, data were created using population controls based on Census 2000 data. - Starting in 2001, data are from the expanded CPS sample. - Beginning with data for 1992, a new question results in different categories than for earlier years. - Data shown as 'High School ,4 years' is now collected by the category 'High School Graduate'. - Data shown as 'College 1 to 3 years', is now collected by 'Some College; and two 'Associate degree' categories. Data shown as 'College 4 years or more', is now collected by the categories, 'Bachelor's degree; Master's degree'; 'Doctorate degree'; and 'Professional degree'. Due to the change in question format, median years of schooling cannot be derived. - Total includes persons who did not report on years of school completed. Source: 1947, and 1952 to 2002 March Current Population Survey, 2003 to 2012 Annual Social and Economic Supplement to the Current Population Survey (non institutionalized population, excluding members of the Armed Forces living in barracks); 1960 Census of Population, 1950 Census of Population, and 1940 Census of Population (resident population). Contact: U.S. Census Bureau, Education and Social Stratification Branch, (301) 763-2464.