Year	Percent
2000-01-01	58.925
2001-01-01	60.925
2002-01-01	61.775
2003-01-01	62.275
2004-01-01	60.625
2005-01-01	60.125
2006-01-01	61.600
2007-01-01	63.950
2008-01-01	64.175
2009-01-01	64.650
2010-01-01	64.950
2011-01-01	66.125
2012-01-01	66.900
2013-01-01	67.125
2014-01-01	68.500
2015-01-01	68.750
2016-01-01	69.500
2017-01-01	68.725