Manuel transmission used to be the norm. The last couple of times I rented a car/got a loaner at the mechanic, I was asked if an automatic would be OK. I have met people who avoid automatics altogether. Probably because they're unsure of how to drive them. TBF the first time I test drove an automatic, the first stop I made, I was glad to be wearing my seat belt, as I was used to use left foot, push that pedal hard and then brake... My wife and I were almost climbing down from the dashboard after that.

When I said earlier that manuels used to be the norm, that's because of the emergence of EVs and PHEVs. Our EV was our first car with no clutch.

Sooo after writing that boring drivel above, I decided to look it up on the most used second hand car platform. Turns out the about half the cars registered as pure ICEs are automatics. But then sampling the search results it's evident that a lot of the cars on the first page, have been registered wrong, and are in fact hybrids. So I don't have a solid figure. I've loitered the sales floor of my mechanic for 30mins, while my car is in for diagnosics. Looks like about 3 out of last 20 or so ICEs I've looked at are automatics.