Year	Percent
2000-01-01	71.550
2001-01-01	72.175
2002-01-01	71.900
2003-01-01	70.550
2004-01-01	69.800
2005-01-01	69.400
2006-01-01	70.200
2007-01-01	71.150
2008-01-01	71.525
2009-01-01	70.825
2010-01-01	68.350
2011-01-01	67.250
2012-01-01	67.025
2013-01-01	65.750
2014-01-01	65.450
2015-01-01	65.575
2016-01-01	65.775
2017-01-01	66.275