Percent of Population 25 Years & Over Who Completed High School; Percentage Who Completed a Bachelor’s Degree: 1940, 1970, and 2010 Source: U.S. Census Bureau,1940 and 1970 Censuses, and the 2010 American Community Survey 24 5 52 11 86 28
High School:
1940, 1970, 2010: 24 ,52 ,86
Bachelor’s Degree:
1940, 1970, 2010: 5, 11, 28
请看链接第20页图
https://www.census.gov/newsroom/cspan/1940census/CSPAN_1940slides.pdf