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Source: Monitoring the Future, Vols I & II (2009)
| Ratios of Crack Use to Marijuana Use Among Young Adults -- Lifetime Use (1986 - 2008) | |||
|---|---|---|---|
| Year | Ages 19 Use to 28 | College Students | 12th Grade Students |
| 1986 | -- | -- | -- |
| 1987 | 0.095 | 0.059 | 0.108 |
| 1988 | 0.108 | 0.063 | 0.102 |
| 1989 | 0.097 | 0.047 | 0.108 |
| 1990 | 0.085 | 0.029 | 0.086 |
| 1991 | 0.082 | 0.032 | 0.084 |
| 1992 | 0.090 | 0.039 | 0.080 |
| 1993 | 0.077 | 0.031 | 0.074 |
| 1994 | 0.082 | 0.024 | 0.079 |
| 1995 | 0.071 | 0.043 | 0.072 |
| 1996 | 0.073 | 0.027 | 0.073 |
| 1997 | 0.067 | 0.030 | 0.079 |
| 1998 | 0.070 | 0.044 | 0.090 |
| 1999 | 0.079 | 0.047 | 0.093 |
| 2000 | 0.083 | 0.049 | 0.080 |
| 2001 | 0.084 | 0.039 | 0.076 |
| 2002 | 0.076 | 0.038 | 0.079 |
| 2003 | 0.082 | 0.061 | 0.078 |
| 2004 | 0.073 | 0.041 | 0.085 |
| 2005 | 0.084 | 0.039 | 0.076 |
| 2006 | 0.076 | 0.038 | 0.079 |
| 2007 | 0.082 | 0.061 | 0.078 |
| 2008 | 0.073 | 0.041 | 0.085 |
Other Available Trend and Comparison Data
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