Year	Percent
2000-01-01	65.150
2001-01-01	65.900
2002-01-01	66.250
2003-01-01	66.925
2004-01-01	65.825
2005-01-01	65.500
2006-01-01	67.425
2007-01-01	68.950
2008-01-01	69.200
2009-01-01	68.750
2010-01-01	68.600
2011-01-01	69.550
2012-01-01	70.875
2013-01-01	71.050
2014-01-01	72.175
2015-01-01	72.200
2016-01-01	72.625
2017-01-01	71.900