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Source: Monitoring the Future, Vols I & II (2009)
| Ratios of Crack Use to Marijuana Use Among Young Adults -- Past Year Use (1986 - 2008) | |||
|---|---|---|---|
| Year | Ages 19 Use to 28 | College Students | 12th Grade Students |
| 1986 | 0.088 | 0.032 | 0.106 |
| 1987 | 0.089 | 0.054 | 0.107 |
| 1988 | 0.097 | 0.040 | 0.094 |
| 1989 | 0.086 | 0.045 | 0.105 |
| 1990 | 0.061 | 0.020 | 0.070 |
| 1991 | 0.050 | 0.019 | 0.063 |
| 1992 | 0.056 | 0.014 | 0.068 |
| 1993 | 0.052 | 0.022 | 0.058 |
| 1994 | 0.043 | 0.017 | 0.062 |
| 1995 | 0.042 | 0.035 | 0.061 |
| 1996 | 0.041 | 0.018 | 0.059 |
| 1997 | 0.037 | 0.013 | 0.062 |
| 1998 | 0.040 | 0.028 | 0.067 |
| 1999 | 0.051 | 0.026 | 0.071 |
| 2000 | 0.043 | 0.026 | 0.060 |
| 2001 | 0.045 | 0.025 | 0.057 |
| 2002 | 0.034 | 0.012 | 0.064 |
| 2003 | 0.034 | 0.039 | 0.063 |
| 2004 | 0.045 | 0.039 | 0.067 |
| 2005 | 0.045 | 0.025 | 0.057 |
| 2006 | 0.034 | 0.012 | 0.064 |
| 2007 | 0.034 | 0.039 | 0.063 |
| 2008 | 0.045 | 0.039 | 0.067 |
Other Available Trend and Comparison Data
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