I had to search track takeout in the archives. Here is the one match I found from 1967:
http://kdl.kyvl.org/cgi/t/text/pagev...45;passterms=1
Chances Dim For Summer Racing At South Florida.
The tracks were arguing for a 10-5 split from the 15% track takeout.
They were getting 7%, and the state was getting 8%.
What happened to the days of 15% track takeout? They vanished along with the people in the stands.