I think there has been an INT in there once or twice, but they have been like +3 in turnover margin EVERY GAME over that time. It's ridiculous.
Edit: Looked it up and you were right. Last Iowa TO was an INT in 2015. And it hasn't been as bad for us as I remembered for margin either. But there's been other stupid stuff like the punt return debacle. I don't know if that gets officially scored as a turnover though.
2021, Iowa +4 (4/0)
2020, game canceled
2019, Iowa +2 (2/0)
2018, Iowa +1 (1/0)
2017, Iowa +1 (1/0)
2016, Iowa +1 (1/0)
2015, Even (1/1)