You can look at it in a number of ways. Abortion as a percentage of the total number of services provided might be heavily diluted - if, for example, every time a script for the Pill is filled, that’s 12 ‘services’ provided per patient per year. The story linked above puts it in another way - if every abortion is preceded by a pregnancy test, and every abortion is followed up by contraception, then a few weeks later with a pelvic exam, yes abortion only counts for 25% of the total services provided to that patient, but the other services were related to that abortion.
If you look at the percentage of patients receiving an abortion, that would paint an entirely different story. One effective note I’ve seen is the percentage of pregnant women who come to PP and then get an abortion. Abortion is effectively diluted if you include mammograms and well-woman care (which is noble and I wish they’d focus on that far more), so it makes sense to look at what happens to pregnancies as they come in - what percentage are taken to term and arranged for adoption, what percentage are kept by the mother, and what percentage end in abortion?
It would also make sense to slice the data by age group and ethnicity. What kind of treatment is being sought by 15-to-19-year-olds, versus that being sought by 35-to-39-year-olds? Do white women have fewer abortions than black women, controlling for economic class and geography?
If you want to do a more in-depth statistical analysis, I’d be happy to help you if you can get data.