To try to make sense of that, if there were 1000 rapes, 68% of them would not be reported. So, from 1000 rapes there would be 320 reported.
12% of them will result in conviction. So that's, 38.4. So, of 1000 rapes, 38.4 people are convicted, leaving 961.6 rapes without conviction.
Of those...
Myths about rape conviction rates are putting people off going to the police | Amanda Bancroft | Comment is free | guardian.co.uk
"the attrition rate for rape is in the region of 12% ... An attrition rate is the amount of convictions resulting from reports of a crime"
"Sixty-eight per cent of...