Well, we have some data right in the screencap. If we assume black and white males commit crimes approximately proportionately to females of the same, then you can use that 88% breakdown.

I know women outnumber men slightly, but easy maths, easy maths:

50% of 13.4% is 6.7%. 88% of 55.9% is 49.2%.

So 6.7% of the population commits 49.2% of the crime. Now, obviously babies aren't committing crimes, and neither are many 80 year olds, so your off the cuff estimate of 5% doing 50% is actually likely surprisingly close.