|
Source: Monitoring the Future, Vol I (2009), Table 5-5a, pp. 206-209
| Ratios of Amphetamine Use to Marijuana Use Among High School Students -- Past Year Use (1991 - 2008) | |||
|---|---|---|---|
| Year | 12th Grade | 10th Grade | 8th Grade |
| 1991 | 0.34 | 0.50 | 1.00 |
| 1992 | 0.32 | 0.54 | 0.90 |
| 1993 | 0.32 | 0.50 | 0.78 |
| 1994 | 0.31 | 0.40 | 0.61 |
| 1995 | 0.27 | 0.41 | 0.55 |
| 1996 | 0.27 | 0.37 | 0.50 |
| 1997 | 0.26 | 0.35 | 0.46 |
| 1998 | 0.27 | 0.34 | 0.43 |
| 1999 | 0.27 | 0.32 | 0.42 |
| 2000 | 0.29 | 0.34 | 0.42 |
| 2001 | 0.29 | 0.36 | 0.44 |
| 2002 | 0.31 | 0.35 | 0.38 |
| 2003 | 0.28 | 0.32 | 0.43 |
| 2004 | 0.29 | 0.31 | 0.42 |
| 2005 | 0.26 | 0.29 | 0.40 |
| 2006 | 0.26 | 0.31 | 0.40 |
| 2007 | 0.24 | 0.33 | 0.41 |
| 2008 | 0.21 | 0.27 | 0.41 |
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