Concerned Women for America, in an article about parental notification of minors having abortions, claims that "seventy-five percent of all abortions are performed on girls (sic) between the ages of 12 and 25.
Googling a little bit comes up with 19% as the age percentage of all abortions performed on teenagers. Assuming about a third of those are on 18 & 19 year old legal adults, the true rate of minors having abortions is about 12% of all abortions. But of course, that statistic would not look so impressive. But it would make the article look a little less ridiculous.