The last few years I'd say more than 90% of guys are from South America, with a few (North) Africans.
It depends on your definition of muscle men. In the years I've gone, I've only ever really seen one or two bodybuilder level muscle guys. I never talked to them so don't know where they were from, though I suspect one of them was Brazilian.
But any time I've gone there are at least a couple of guys with stunning physiques with well defined muscles and six-pack abs, and that's on the slow days. On the busy days there have always been plenty.
Most of the muscular guys look like well trained physiques that come from doing sports instead of the gym, so yeah, if you're looking for HUGE muscles and 2% body fat then no, that's a bit of a rare sight, and always has been for as long as I've gone.
But if you're into guys with hard, defined muscles with visible six-pack abs and v-lines, there's always been guys like that whenever I've visited. They just aren't necessarily HUGE like bodybuilders.