Are there more bumper stickers on cars now then there were in recent previous decades?

I remember, as a child, complaining to my dad that there were all these cool bumper stickers available (“I’m going crazy, want to come along?”), and we didn’t have a single one on our cars. To date, my parents have never had a bumper sticker on any of their cars.

But I also seem to remember that bumper stickers were rare things. I may be wrong.

Somebody do a survey, okay? I’ll be here when you’re done.