Data through 1980 is based on a 10% sample of all test takers; data after 1980 is based on all test takers. Data prior to class year 1985 include all tests taken by all participants and may include students other than seniors (typically, juniors). Data for 1985 and on are for seniors who graduated in the year shown and had taken the ACT in their junior or senior years. Data for 2013 and on includes extended-time test takers. Possible scores on each part of the ACT range from 1 to 36. Prior to 1990, the Reading section was called Social Studies and the Science Reasoning section was called Natural Science.

SOURCES: 1990 NCES Digest of Education Statistics (nces.ed.gov): data years 1970, 1975, 1977-1989; ACT, Inc. Research Report 71 (1976): data years 1971, 1972; 1989 Almanac of Higher Education (NEA): data years 1973, 1974, 1976; 2000 NCES Digest of Education Statistics: data years 1990-2000; 2010 NCES Digest of Education Statistics: data years 2001-2010; ACT Profile Report – National: data years 2011-present

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