| Trends in Average Cocaine Purity at Four Purchase Levels (% by weight) | ||||
|---|---|---|---|---|
| Year | < 10 grams | 10 - 50 grams | 50 - 750 grams | > 750 grams |
| 1981 | 49 | 52 | 70 | 85 |
| 1982 | 50 | 52 | 75 | 88 |
| 1983 | 57 | 62 | 80 | 91 |
| 1984 | 58 | 65 | 78 | 89 |
| 1985 | 53 | 61 | 72 | 85 |
| 1986 | 62 | 71 | 80 | 88 |
| 1987 | 70 | 77 | 83 | 88 |
| 1988 | 74 | 79 | 81 | 86 |
| 1989 | 71 | 73 | 77 | 83 |
| 1990 | 58 | 60 | 67 | 79 |
| 1991 | 68 | 70 | 74 | 84 |
| 1992 | 69 | 72 | 76 | 83 |
| 1993 | 68 | 67 | 75 | 83 |
| 1994 | 69 | 70 | 76 | 84 |
| 1995 | 66 | 68 | 71 | 82 |
| 1996 | 68 | 69 | 73 | 83 |
| 1997 | 65 | 67 | 70 | 82 |
| 1998 | 68 | 68 | 71 | 80 |
| 1999 | 63 | 62 | 66 | 77 |
| 2000 | 58 | 56 | 59 | 73 |
| 2001 | 56 | 53 | 58 | 71 |
| 2002 | 62 | 60 | 62 | 74 |
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 11, p.68