Year	Percent
1995-01-01	59.3946465350000
1996-01-01	58.5255662175000
1997-01-01	57.3899137600000
1998-01-01	56.0794334825000
1999-01-01	55.5743727600000
2000-01-01	55.6226963525000
2001-01-01	55.2788255650000
2002-01-01	54.1478142000000
2003-01-01	54.0050388875000
2004-01-01	54.8450037025000
2005-01-01	55.4910155200000
2006-01-01	56.2565039050000
2007-01-01	57.5753511975000
2008-01-01	58.4116132100000
2009-01-01	57.0807052675000
2010-01-01	57.9560707375000
2011-01-01	58.8476778975000
2012-01-01	64.6250000000000
2013-01-01	65.1083333333333
2014-01-01	65.3833333333334
2015-01-01	65.7416666666667
2016-01-01	65.8833333333334
2017-01-01	66.1333333333333