Yes, let's put up unknown stats to support your "guess"!
Lmao.
Try not to be your usual asshat self, just for a day.
It's not unknown how many crimes where the victim is black or white are unsolved. My guess, and I don't have the data to show right now, is that in crimes where the victim is black go unsolved a lot more than when the victim is white. This would take the total numbers of crimes that you've pulled off the FBI's website from 2011 up quite a bit. I'd be happy to see if I can find those if you dispute that this is probably the case.
If we know, just for example, that 40% of crimes where the victim is black remain unsolved, and 15% of the crimes where the victim is white are unsolved, then we can extrapolate using the percentages of crimes black/black, white/black or black/white accordingly. It sure would change the picture from the convenient #'s you reported.
For example, this site shows Washington DC. and Illinois ranking at the top of unsolved homicides. Well, we don't have to be a scientist to take a gander and what race those stats primarily represent.