Year	Percent
2001-01-01	66.650
2002-01-01	66.375
2003-01-01	65.775
2004-01-01	65.000
2005-01-01	65.125
2006-01-01	65.850
2007-01-01	66.775
2008-01-01	66.800
2009-01-01	64.750
2010-01-01	64.475
2011-01-01	65.400
2012-01-01	65.450
2013-01-01	65.725
2014-01-01	66.225
2015-01-01	66.650
2016-01-01	67.050
2017-01-01	67.825