| Trends in Crack "Expected" Purity at Three Purchase Levels (% by weight) | |||
|---|---|---|---|
| Year | < 1 gram | 1 - 15 grams | > 15 grams |
| 1986 | 84 | 77 | 75 |
| 1987 | 83 | 80 | 68 |
| 1988 | 86 | 84 | 78 |
| 1989 | 87 | 83 | 75 |
| 1990 | 81 | 79 | 62 |
| 1991 | 86 | 83 | 76 |
| 1992 | 82 | 81 | 76 |
| 1993 | 81 | 79 | 70 |
| 1994 | 81 | 79 | 72 |
| 1995 | 76 | 74 | 66 |
| 1996 | 76 | 74 | 65 |
| 1997 | 73 | 70 | 60 |
| 1998 | 75 | 72 | 62 |
| 1999 | 72 | 67 | 57 |
| 2000 | 68 | 62 | 52 |
| 2001 | 68 | 62 | 50 |
| 2002 | 70 | 64 | 55 |
Source: Office of National Drug Control Policy
The Price and Purity of Illicit Drugs: 1981 Through the Second Quarter of 2003.
November 2004 (Publication Number NCJ 207768), Table 4, p.61