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Homicides involving multiple offenders: 20.3%
http://bjs.ojp.usdoj.gov/content/pub/pdf/htius.pdf
The sharp percentage spike is probably due to the number of homicides dropping dramatically in about 1990 or so. I would suspect the number of multiple-offender homicide incidents remained fairly constant, but as the rate fell, it became a larger percentage. Same size slice of pie, but from a smaller pie, if you will.
There's a slightly more current summery here:
http://bjs.ojp.usdoj.gov/content/pub/pdf/htius.pdf
Page 24.
