Why wouldn’t it be accurate? Following a strictly mathematical model, albeit somewhat and sensitive to the subject matter, this is simple regression to the mean. When something new begins there is always a growth that far out paces where it will reside over the long term. In the case of abortion, the new law opened up an outlet to millions of women to obtain something that was limited in nature to them previously. Hence, the large number of abortions throughout the 70s and early 80s.
As the newness and availability of abortions became common, to some extent social norms, societal pressures, education, etc. all produced a regression to the mean. While abortions are still too high and way too common, the story is accurate and woukd have no reason to disbelieve.
Here’s one reason: sky high STD rates. Unless those STDs are being acquired in large numbers by gays/geezers, then you’d expect that much unprotected sex to result in an increase in unwanted pregnancies.
In any case, when it comes to any info generated by government, 3 words: Trust but verify. :-)
One abortion is too high, and too common.