In 2007 , umpires correctly called only 76.8 % of pitches within the rulebook zone .
87.4 % of pitches outside the rulebook zone based on the Sportvision data .
In 2007 , umpires correctly called only 76.8 % of pitches within the rulebook zone and 87.4 % of pitches outside the rulebook zone based on the Sportvision data .