Monitoring the Future -- Trends in Past Year Marijuana Use
vs Alcohol Use by Young Adults (1986 - 2008)

Ratios of Marijuana Use to Alcohol Use Among Young Adults -- Past-Year Use (1986 - 2008)
Year	Ages 19 Use to 28	College Students	12th Grade Students
1986	0.41	0.45	0.46
1987	0.39	0.41	0.42
1988	0.36	0.39	0.39
1989	0.33	0.38	0.36
1990	0.30	0.33	0.33
1991	0.27	0.30	0.31
1992	0.29	0.32	0.29
1993	0.29	0.33	0.36
1994	0.30	0.35	0.42
1995	0.31	0.38	0.47
1996	0.32	0.40	0.49
1997	0.32	0.38	0.51
1998	0.33	0.42	0.50
1999	0.33	0.42	0.51
2000	0.33	0.41	0.50
2001	0.35	0.43	0.50
2002	0.35	0.42	0.51
2003	0.35	0.41	0.50
2004	0.35	0.41	0.49
2005	0.35	0.43	0.50
2006	0.35	0.42	0.51
2007	0.35	0.41	0.50
2008	0.35	0.41	0.49

Other Available Trend and Comparison Data
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