One of my colleagues went to University of Texas at Austin during early 80s.
He said they had a strike because the university increased tuition per hour by 50% or more.
What was interesting was the increase was in single digit dollars. I see that in 1980 one could pay $226 for 15 credit hours. It is now about 4600 or more.
The chart below stops in 2002. It has almost doubled since.