Trends in Average Crack Purity
(1981 - 2002)

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


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