WAY, way more than 20 years (so it can't be blamed on Clinton)....I finished grad school in 1973, and the practice was very will established even then. I suspect it dates back to the days of the post WWII "GI Bill". Gotta keep all those plebian sorts out of upper-class occupations, y'know.
And yes, I "am" a dinosaur (at least according to nieces and nephews).
I’m actually not blaming it on Clinton, but I remember news stories in the ‘90’s about how bad it would be if there would be too doctors. As I recall, the feds somehow began paying medical schools to decrease the numbers of medical students.
Remember, also, how many medical schools opened in the ‘80’s and ‘90’s in the Caribbean and Central America because there were not enough openings in US medical schools.