Year	Percent
2000-01-01	61.225
2001-01-01	59.150
2002-01-01	56.900
2003-01-01	56.475
2004-01-01	57.175
2005-01-01	58.850
2006-01-01	60.875
2007-01-01	63.650
2008-01-01	66.300
2009-01-01	66.125
2010-01-01	65.325
2011-01-01	65.975
2012-01-01	66.300
2013-01-01	66.600
2014-01-01	68.200
2015-01-01	69.250
2016-01-01	70.975
2017-01-01	72.800