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Defensive Efficiency Through The Years

by Jason Brannon

I figured the Defensive Efficiency (DER) for all of Major League Baseball for every decade going back to 1901. Rather than gradually increasing over time, DER seems to correlate inversely with offense.

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Years DER
1901-1910 .687
1911-1920 .691
1921-1930 .682
1931-1940 .689
1941-1950 .706
1951-1960 .709
1961-1970 .708
1971-1980 .704
1981-1990 .702
1991-2000 .690
2001-2010 .691
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