Rank Institution Doctorate recipients
1. U. of Texas at Austin 849
2. U. of Wisconsin at Madison 823
3. U. of Michigan at Ann Arbor 819
4. U. of California at Berkeley 796
5. U. of Minnesota-Twin Cities 787
6. Stanford U. 763
7. U. of Florida 730
8. Purdue U. at West Lafayette 727
9. Ohio State U. 716
10. U. of California at Los Angeles 689
https://www.chronicle.com/article/universities-that-granted-...
There were ~55K doctorates issued in the US overall.
https://www.nsf.gov/news/news_summ.jsp?cntn_id=297405
So really, 78 is a year is pretty low for a place like Caltech.
Except that Caltech is pretty small. When I attended, the student body, undergrad and grad, was about 1500. It was smaller than my high school.
So you can't compare a current day number to a 100year average
[1] https://ncses.nsf.gov/pubs/nsf20301/assets/data-tables/table...