Pitchers: Lefty v. Righty Innings

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Recent seasons:
Year  Right% Left%
2000 75.61% 24.39%
2001 76.05% 23.95%
2002 74.85% 25.15%
2003 73.05% 26.95%
2004 72.79% 27.21%
2005 73.37% 26.63%
2006 73.06% 26.94%
2007 72.90% 27.10%
2008 71.86% 28.14%
2009 72.64% 27.36%
2010 72.14% 27.86%
2011 73.37% 26.63%
2012 70.10% 29.90%

For 1903-2012:
Min 64.07% 18.33%
Max 81.67% 35.93%
Ave 72.98% 27.02%



For batter plate appearances (PA), the annual average for righty batters was about 63.5%.  For righty pitchers it's about 73%.  This suggests that righty batters face righty pitchers more than lefty batters face lefty pitchers.  That would probably be helpful to lefty batters.