I don’t specifically know about the US experience, but mass covid vaccination didn’t appear to be all that easy to achieve where I live. It required an overwhelming government information campaign, removal of the ability to engage in many activities if unvaccinated, multiple “lockdowns” and the threat of mandating compliance. I almost wonder that anyone managed to get through all of that when refusing the vaccine.

I'd say more than 81% generally comply with the law. Given the extreme measures employed to "get" people to take it, that might be a closer comparison than whatever it is you're imagining comparing this to.

to play devil's advocate:

you can get 81% of the population to do a lot of things, when you lock them in their homes, forbid them to see their family or get a coffee or go to work unless they do the thing you want them to do.

(i am fully vaccinated, but i wouldn't consider what happened successful in any way)