This comparison makes no sense whatsoever, I'm pretty sure if you looked at the data 100 years ago the student body was significantly smaller and with few PhD's across the board.
So you can't compare a current day number to a 100year average
Interesting, those are all somewhere in the range between elite and thoroughly respectable. There's no random crap schools you've never heard of pumping out oodles of PhDs every year, which is good news at least.