Year	Percent
2000-01-01	72.925
2001-01-01	73.800
2002-01-01	73.725
2003-01-01	72.950
2004-01-01	71.575
2005-01-01	71.025
2006-01-01	70.775
2007-01-01	72.750
2008-01-01	73.175
2009-01-01	72.800
2010-01-01	69.025
2011-01-01	68.100
2012-01-01	69.225
2013-01-01	69.200
2014-01-01	67.375
2015-01-01	68.475
2016-01-01	68.200
2017-01-01	68.350