| Lifetime | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | '97-'98 change (a) |
|
| Hallucinogens Other Than LSD |
|||||||||
| 8th Grade | 1.4 | 1.7 | 1.7 | 2.2 | 2.5 | 3.0 | 2.6 | 2.5 | -0.1 |
| 10th Grade | 2.2 | 2.5 | 2.8 | 3.8 | 3.9 | 4.7 | 4.8 | 5.0 | +0.2 |
| 12th Grade | 3.7 | 3.3 | 3.9 | 4.9 | 5.4 | 6.8 | 7.5 | 7.1 | -0.4 |
| PCP (e) | |||||||||
| 8th Grade | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 10th Grade | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 12th Grade | 2.9 | 2.4 | 2.9 | 2.8 | 2.7 | 4.0 | 3.9 | 3.9 | 0.0 |
| MDMA (Ecstasy)(e) | |||||||||
| 8th Grade | -- | -- | -- | -- | -- | 3.4 | 3.2 | 2.7 | -0.5 |
| 10th Grade | -- | -- | -- | -- | -- | 5.6 | 5.7 | 5.1 | -0.6 |
| 12th Grade | -- | -- | -- | -- | -- | 6.1 | 6.9 | 5.8 | -1.1 |
| Cocaine | |||||||||
| 8th Grade | 2.3 | 2.9 | 2.9 | 3.6 | 4.2 | 4.5 | 4.4 | 4.6 | +0.2 |
| 10th Grade | 4.1 | 3.3 | 3.6 | 4.3 | 5.0 | 6.5 | 7.1 | 7.2 | +0.1 |
| 12th Grade | 7.8 | 6.1 | 6.1 | 5.9 | 6.0 | 7.1 | 8.7 | 9.3 | +0.6 |
| Lifetime | |||||||||
| 1991 | 1992 | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | '97-'98 change (a) | |
| Crack | |||||||||
| 8th Grade | 1.3 | 1.6 | 1.7 | 2.4 | 2.7 | 2.9 | 2.7 | 3.2 | +0.5s |
| 10th Grade | 1.7 | 1.5 | 1.8 | 2.1 | 2.8 | 3.3 | 3.6 | 3.9 | +0.3 |
| 12th Grade | 3.1 | 2.6 | 2.6 | 3.0 | 3.0 | 3.3 | 3.9 | 4.4 | +0.5 |
| Other Cocaine (f) | |||||||||
| 8th Grade | 2.0 | 2.4 | 2.4 | 3.0 | 3.4 | 3.8 | 3.5 | 3.7 | +0.2 |
| 10th Grade | 3.8 | 3.0 | 3.3 | 3.8 | 4.4 | 5.5 | 6.1 | 6.4 | +0.3 |
| 12th Grade | 7.0 | 5.3 | 5.4 | 5.2 | 5.1 | 6.4 | 8.2 | 8.4 | +0.2 |
| Heroin (g) | |||||||||
| 8th Grade | 1.2 | 1.4 | 1.4 | 2.0 | 2.3 | 2.4 | 2.1 | 2.3 | +0.2 |
| 10th Grade | 1.2 | 1.2 | 1.3 | 1.5 | 1.7 | 2.1 | 2.1 | 2.3 | +0.2 |
| 12th Grade | 0.9 | 1.2 | 1.1 | 1.2 | 1.6 | 1.8 | 2.1 | 2.0 | -0.1 |
| Other Opiates (h) | |||||||||
| 8th Grade | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 10th Grade | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| 12th Grade | 6.6 | 6.1 | 6.4 | 6.6 | 7.2 | 8.2 | 9.7 | 9.8 | +0.1 |
| Stimulants (h) | |||||||||
| 8th Grade | 10.5 | 10.8 | 11.8 | 12.3 | 13.1 | 13.5 | 12.3 | 11.3 | -1.0 |
| 10th Grade | 13.2 | 13.1 | 14.9 | 15.1 | 17.4 | 17.7 | 17.0 | 16.0 | -1.0 |
| 12th Grade | 15.4 | 13.9 | 15.1 | 15.7 | 15.3 | 15.3 | 16.5 | 16.4 | -0.1 |