According to the figures cited by Wikipedia somewhere between 6% and 26%, maybe, but the latter is real hinky and relies on a study that I can’t even find named or specified as peer reviewed or not (great signs!) in a book that is specifically anti-abortion.

The 6% number is from a real peer reviewed study, though. And apparently the non-rape adoption rate is around 1%.

https://doi.org/10.1016/S0002-9378(96)70141-2