Monitoring the Future -- Trends in Past Month Amphetamine Use
vs Marijuana Use by Adolescents (1991 - 2008)

Ratios of Amphetamine Use to Marijuana Use Among High School Students -- Past Month Use (1991 - 2008)
Year	12th Grade	10th Grade	8th Grade
1991	0.23	0.38	0.81
1992	0.24	0.44	0.89
1993	0.24	0.39	0.71
1994	0.21	0.28	0.46
1995	0.19	0.31	0.46
1996	0.19	0.27	0.41
1997	0.20	0.25	0.37
1998	0.20	0.27	0.34
1999	0.19	0.26	0.35
2000	0.23	0.27	0.37
2001	0.25	0.28	0.35
2002	0.26	0.29	0.34
2003	0.24	0.25	0.36
2004	0.23	0.25	0.36
2005	0.20	0.24	0.35
2006	0.20	0.25	0.32
2007	0.20	0.28	0.35
2008	0.15	0.20	0.38

Other Available Trend and Comparison Data
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