As one who is "pro-life", I believe that 99% of abortions are uncalled for under any circumstance.That's a really high number. Let's think about that a bit more. In this 2005 study, 1% of women seeking abortion said one reason they wanted an abortion because they had been raped. If this is the only justification you allow, then you have your 99%.
But most people also say abortion is justified if it is necessary to save the life of the mother. This makes sense, especially when you are look at situations like ectopic pregnancies, where often your choice is to continue with the pregnancy, and have both the mother and the fetus die, or abort the fetus, and at least save one life. The survey above doesn't list cases where the mother's life is at stake, but say that 12% of women list concerns for their own health as reasons for abortion. Of these, 4% listed a physical problem with their health as the "most important" reason they were having an abortion. It is not clear, however, how many of these cases are cases where the mother's life is in danger.
There are also cases where the health of the fetus can motivate an abortion. We've already looked at one case like that in this class: Tay-Sachs disease. A baby born with Tay-Sachs disease will live normally for about a year, but after that, their brain will begin to degenerate, and what follows are seizures, blindness and death by age 5. Many people would say that it is better to have not been born than it is to have such a brief life filled with suffering. Again with these studies, we don't have clear number for cases of abortion that are like the Tay-Sachs case. The 2005 study says that for 13% of the women seeking abortions, the future health of the fetus as a motivation, and for 3% of women it was the most important reason.As with the question of the mother's health, it is not clear what medical problems are being considered here.
So it looks like somewhere between 8% and 25% of abortions are in situations that people commonly view as legitimate reasons to have an abortion. (Gallup reports that 70% of Americans believe that abortion is acceptable in some or all circumstances, and rape and health of the mother are the most common exceptions.) Given this information, do you stand by the 99% number?