Year	Percent
2001-01-01	64.150
2002-01-01	64.175
2003-01-01	63.650
2004-01-01	62.800
2005-01-01	62.450
2006-01-01	62.975
2007-01-01	63.900
2008-01-01	63.850
2009-01-01	62.250
2010-01-01	61.350
2011-01-01	62.600
2012-01-01	63.000
2013-01-01	63.275
2014-01-01	63.775
2015-01-01	64.450
2016-01-01	65.075
2017-01-01	65.675