Monitoring the Future -- Trends in Marijuana Use
vs Alcohol Use Among 12th Grade Students

Source: Monitoring the Future, Vol I (2009), Tables 5-1, 5-2, and 5-3, pp.191-199

Ratios of Marijuana Use vs Alcohol Use Among 12th Grade Students (1975 - 2008)
Year	Lifetime	Past Year	Past Month
1975	0.52	0.47	0.40
1976	0.57	0.52	0.47
1977	0.61	0.55	0.50
1978	0.64	0.57	0.51
1979	0.65	0.58	0.51
1980	0.65	0.56	0.47
1981	0.64	0.53	0.45
1982	0.63	0.51	0.41
1983	0.62	0.48	0.39
1984	0.59	0.47	0.38
1985	0.59	0.47	0.39
1986	0.56	0.46	0.36
1987	0.54	0.42	0.32
1988	0.51	0.39	0.28
1989	0.48	0.36	0.28
1990	0.45	0.33	0.25
1991	0.42	0.31	0.26
1992	0.37	0.29	0.23
1993	0.44	0.36	0.32
1994	0.48	0.42	0.38
1995	0.52	0.47	0.41
1996	0.57	0.49	0.43
1997	0.61	0.51	0.45
1998	0.60	0.50	0.44
1999	0.62	0.51	0.45
2000	0.61	0.50	0.43
2001	0.61	0.50	0.45
2002	0.61	0.51	0.44
2003	0.60	0.50	0.45
2004	0.60	0.49	0.41
2005	0.60	0.49	0.42
2006	0.58	0.47	0.40
2007	0.58	0.48	0.42
2008	0.59	0.49	0.45
Average	0.57	0.47	0.40

Other Available Trend and Comparison Data
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