1940年、1970年、2010年美国完成高中、大学数据（自己看链接中第20页，右下角数字为页数）

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