OK, I did a quick check 66 - 82 (66 is the first year SB/single reached as high as .08, and it remained there or higher (up to .13) except for one year. SB percentage variation from historical is -1.1% the way its presented appears to mean - 1.1% of the success percentage.
This is not weighted by the number of attempts. I just quickly ran down the simulation historical accuracy chart.
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