Bureau of Justice Statistics,
Homicide trends in the United States,
www.ojp.usdoj.gov/bjs/homicide,
Date of release: January 17 2007,

Percent of Homicides Cleared by Arrest,

Year,Percent cleared
1976,79
1977,76
1978,76
1979,73
1980,72
1981,72
1982,74
1983,76
1984,74
1985,72
1986,70
1987,70
1988,70
1989,68
1990,67
1991,67
1992,65
1993,66
1994,64
1995,65
1996,67
1997,66
1998,69
1999,69
2000,63
2001,62
2002,64
2003,62
2004,63
2005,62

"Source: FBI, Supplementary Homicide Reports, 1976-2005",
See the methodology section in 'Additional Information About the Data' for weighting and imputation procedures used.,