Stew Thornley has been compiling information on baseball errors, and he’s posted his findings, year by year. Here is the rate of errors per game and per ball in play for the last five decades:
Decade E/G E/BIP 1960's 1.76 3.15% 1970's 1.76 3.05% 1980's 1.63 2.86% 1990's 1.46 2.60% 2000's 1.31 2.35%
So what’s the story here? Are fielders getting better? Maybe the gloves are better? Or are scorers getting more lenient?
(thanks to the Retrosheet mailing list, as inspired by Tango)