Comment by bell-cot

It's the American Institutional Confidence Poll

And from the Brookings (linked) article: "For the results we describe below, we rely on a two-wave panel survey in which the same respondents were interviewed twice: first pre-COVID in June and July 2018 and then in the midst of the COVID pandemic in July-October 2021."

That really was not a good time period for institutional trust in America.