Year	Percent
2000-01-01	54.550
2001-01-01	55.125
2002-01-01	55.525
2003-01-01	57.075
2004-01-01	57.300
2005-01-01	58.625
2006-01-01	62.175
2007-01-01	63.125
2008-01-01	63.325
2009-01-01	57.650
2010-01-01	55.475
2011-01-01	59.325
2012-01-01	61.125
2013-01-01	62.375
2014-01-01	63.300
2015-01-01	65.425
2016-01-01	65.925
2017-01-01	67.725