Interesting. Questions on one question: Looking at the record from 1980 - 1989, I see 6 Michigan wins. I assume this was an oversight?
Not an oversight. Your team won the 1980s with a 6–4 record. You can check it with my work, Wikipedia, or Winsipidia.
You might be thinking of the '90s when Ohio State went 2–7–1.
In addition, it is possible there are some decades where neither team has a majority of the wins (i.e., only 5 wins.)
Yes, it happened it two decades and they were the 1950s and 1930s. Of the 13 decades (if you count the one game played in the 1890s) Ohio State has won four, lost seven and tied two.
Thanks for the questions. It made me
double triple check the 1980s to make sure they were correct.