Source: Monitoring the Future
| Ratios of Marijuana to Alcohol Use -- Past-Year Use (1986 - 2004) | |||
|---|---|---|---|
| Year | Ages 19 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 |
| Averages: | 0.33 | 0.39 | 0.44 |
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