The last time I remember seeing those statistics, the percentage was minuscule.
I seem to recall reading somewhere that only about one in 200 rapes results in pregnancy (something about the woman being stressed largely prevents it). And not all of those pregnant through rape choose to kill the kid.
Apparently, it’s considered from 1 to almost 5%; it’s hard to say when abortions make the evidence disappear. I’ve also read that the some victims are assaulted by the abortionists who know they are unlikely to be reported. How sick is that?