Year	Percent
2000-01-01	68.725
2001-01-01	70.400
2002-01-01	70.050
2003-01-01	68.350
2004-01-01	65.850
2005-01-01	65.200
2006-01-01	66.175
2007-01-01	68.425
2008-01-01	69.300
2009-01-01	67.950
2010-01-01	63.025
2011-01-01	61.275
2012-01-01	61.125
2013-01-01	60.075
2014-01-01	58.800
2015-01-01	60.750
2016-01-01	60.825
2017-01-01	62.275