I thought I'd expand the time period to track 9+ win streaks of Big Ten teams. The period in the table below represents the last 8 full years. That is the period from the beginning of the conference's current 14 team membership (2014) until this season with the 2020 short year excluded.
The table of teams
who have had a streak of 3 or more 9+ win seasons during that time are shown below with the length and years of the streak. There are 5 Big Ten teams who have done that: OSU, MICH, PSU, WISC, and MINN during the period. Three of those streaks are current.
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