I'm not finding a lot of people answering this question from a cursory search, but I found one source saying 33% globally[0]. (This may include eggs and dairy.)

Personally, I eat more protein than I did when I ate meat, though to be fair I still eat eggs. It's not hard at all to get adequate protein.

[0] https://healthyeating.sfgate.com/worlds-main-sources-protein...