@monydad - To be fair, the NSF data is for science and engineering PhDs. I doubt that the data are available, but it would be nice to see information for liberal arts PhDs, medical students, law students, and MBA students.
Interestingly, Cornell is a hybrid public/private university. Four of its colleges are land-grant and operated under contract with the State of New York and with reduced tuition for New York residents: Veterinary Medicine; Industrial and Labor Relations; Human Ecology; and Agricultural and Life Sciences.