Source: University of Michigan, Monitoring The Future Studies
| Lifetime Crack Use Within Cohort -- Classes of 1995 through 2003 | |||
|---|---|---|---|
| Class of: | 8th Grade | 10th Grade | 12th Grade |
| 1995 | 1.3 | 1.8 | 3.0 |
| 1996 | 1.6 | 2.1 | 3.3 |
| 1997 | 1.7 | 2.8 | 3.9 |
| 1998 | 2.4 | 3.3 | 4.4 |
| 1999 | 2.7 | 3.6 | 4.6 |
| 2000 | 2.9 | 3.9 | 3.9 |
| 2001 | 2.7 | 4.0 | 3.7 |
| 2002 | 3.2 | 3.7 | 3.8 |
| 2003 | 3.1 | 3.1 | 3.6 |