Yes, that is true. The trend rather supports my hypothesis that those who use abortion as birth control are effectively removing certain genetic characteristics from the population.
In addition to your comments, one of the posters at the Lifesite link pointed out that teenagers may be forgoing sex in larger numbers because of the high incidence of STD's. They have reached epidemic proportions among the young.
I think we can thank Planned Parenthood for much of that. By encouraging irresponsible behavior for the last few decades, they've promoted the circumstances where STDs spread. Teens who don't take precautions against pregnancy certainly aren't protecting themselves against STDs.
Indeed, although PP has gotten a big assist from popular music, movies, TV, and the ongoing "pornification" of the culture in general. The media are awash in depictions of and incitements to debauched living.