Attitudes Regarding Marijuana Laws: Trends in 12th Graders

(Entries are percentages)
  1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019   2018 -
2019
Change
  2014 -
2019
Change
Proportional
Change
  Peak year -
2019
Change
Proportional
Change
  Low year -
2019
Change
Proportional
Change
Not use it 12th Grade 50.4 50.6 46.4 50.2 53.3 55.2 60.0 60.1 62.0 63.0 62.4 64.9 69.0 70.1 72.9 70.7 72.5 69.0 64.6 60.2 59.9 56.4 58.3 59.0 60.3 58.1 58.6 57.9 56.4 60.1 62.5 61.5 60.4 59.9 55.4 54.9 55.8 56.3 52.7 52.6 51.0 46.5 45.0 42.9 | -2.1 | -9.9*** -18.7 | -30.0*** -41.2 | 0.0 0.0
Try it 12th Grade 8.1 7.1 7.1 6.1 6.8 6.0 6.3 7.2 6.6 7.5 7.6 7.3 7.1 6.7 7.0 6.3 7.4 7.3 7.6 8.8 8.8 9.1 8.1 9.3 7.3 9.3 8.4 10.6 10.6 8.9 9.7 8.8 8.9 9.7 10.6 9.6 10.6 10.3 10.7 12.9 13.9 15.2 15.9 17.1 | 1.2 | 6.4*** 59.3 | 0.0 0.0 | 0.0 0.0
Same use 12th Grade 24.7 26.9 30.9 29.1 27.3 24.8 21.7 19.8 19.1 17.7 16.8 16.2 13.1 13.0 10.1 11.7 10.2 11.9 14.3 17.1 17.3 18.4 17.9 15.2 18.5 16.8 17.2 15.6 17.4 15.2 13.8 15.1 14.8 14.7 16.1 17.6 16.8 15.0 16.7 14.0 16.1 16.7 15.5 16.5 | 0.9 | -0.2 -1.0 | -14.4*** -46.7 | 6.4*** 62.7
More use 12th Grade 7.2 7.4 6.2 6.0 4.2 4.7 3.8 4.9 4.7 3.7 5.0 4.1 4.3 2.4 2.7 3.3 3.2 3.5 4.7 4.9 4.8 6.1 5.9 6.5 5.4 6.3 7.1 7.1 6.0 6.0 5.6 5.5 5.5 5.7 7.3 7.3 8.2 8.5 7.7 8.6 7.8 10.1 9.2 10.4 | 1.2 | 2.7* 35.5 | 0.0 0.0 | 0.0 0.0
Less use 12th Grade 1.5 1.5 2.7 2.5 2.6 2.5 2.2 1.5 1.6 1.6 2.0 1.3 1.5 2.1 1.1 1.6 1.0 1.4 1.5 1.6 1.6 2.0 2.0 1.9 1.6 2.2 1.7 1.6 1.6 1.8 1.1 1.5 1.4 1.1 1.8 1.7 1.6 1.5 1.0 1.4 0.8 1.3 1.3 0.9 | -0.4 | -0.1 -14.4 | -1.8*** -67.0 | 0.1 6.2
Don't know 12th Grade 8.1 6.6 6.6 6.1 5.9 6.9 6.0 6.4 6.0 6.5 6.1 6.3 5.0 5.7 6.1 6.4 5.7 7.0 7.3 7.4 7.7 7.9 7.8 8.1 7.0 7.3 7.0 7.2 8.0 8.0 7.3 7.6 9.0 8.8 8.8 8.9 7.1 8.5 11.2 10.5 10.4 10.1 13.0 12.3 | -0.8 | 1.1 9.7 | -0.8 -5.8 | 0.0 0.0

Source: The Monitoring the Future study, the University of Michigan.
If marijuana were legal to use and legally available, which of the following would you be most likely to do?
(1) Not use it, even if it were legal and available, (2) Try it, (3) Use it about as often as I do now,(4) Use it more often than I do now, (5) Use it less often than I do now, (6) Don't know.
The year with the highest percentage is noted in bold. The year with the lowest percentage after that peak is underlined.
For a table of Ns click here: Notes
*** = p < 0.001 ** = p < 0.01 * = p < 0.05