I've seen a list of how many times a program has been ranked #1 in the AP which does a pretty good job, not too different from the above. You could also count top ten rankings end of year with a 10-9-8-7 point value, etc. Ohio State "shines" in having no bad three year stretches, they've always been pretty good, and the few losing years are spotted between really good years. I'd probably have Army in there somewhere, Minnesota? Pitt? FSU?