This data is from MLB games from 1903-2022, including postseason games. Data are complete back to 1973, mostly complete back to 1950, and somewhat complete back to 1916. It omits games that are less than 9 innings (doubleheaders in 2020) as well as extra inning games where a runner starts on second base (non-playoff games since 2020). All data is available at Retrosheet.
Linked from: FiveThirtyEight (search for "eighth inning"), The Washington Post, Jayson Stark's "Weird and Wild" column and on the Starkville podcast (starts around the 83:00 mark), FanGraphs' Effectively Wild podcast (around the 40:30 mark), CBS Sports, CBS Sports again, The Athletic, Royals Review, Beyond the Box Score, Talking Chop, and more!
Articles written with this data:
Source files available on GitHub.
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