Rape in the United States I often wondered about this.
"The U.S. Department of Justice compiles statistics on crime by race, but only between and among people categorized as black or white. In 2005 there were 111,490 white and 36,620 black victims of rape or sexual assault. In 2005, out of the 111,490 cases involving white victims, 44.5% had white offenders and 33.6% had black offenders, while the 36,620 black victims had a figure of 100% black offenders, numbers of white offenders were estimated to be negligible (extrapolated from a sample size of fewer than 10 instances)."
Though wiki is sometimes wiki graffiti it appears that the above is documented unless I misread this DoJ document that apparently the Obama/Holder Dept. of Just Us has not yet erased See Percent distribution of single-offender victimizations, based on race of victims, by type of crime and perceived race of offender.