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File has been updated with 1910, 1915, 1920, 1925, 1938 and 1958, as well as a slightly revised 1901 (double counting Doc Newton was the main culprit).
ITPHR rates dropped sharply from 44% in 1910 to 18% at the dawn of the lively ball era in 1920, and were already down to less than 2% by 1938. I have an 0.62% rate for 1958; judging from the SABR article it looks like the rate actually crept back up a little bit in the '60s-'70s, something I might examine next.
Griffith Stadium is definitely confirmed as being a very good ITPHR park, as is Forbes Field and Braves Field prior to the 1928 alteration. Yankee Stadium in its "Death Valley" days was also above average. Not sure why Ebbets Field was good for them in 1915 and '20 but bad for them after that (dimensions didn't change that much in the early '20s)...
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