Year	Percent
2003-01-01	63.975
2004-01-01	64.250
2005-01-01	64.425
2006-01-01	64.500
2007-01-01	64.900
2008-01-01	65.175
2009-01-01	65.700
2010-01-01	65.800
2011-01-01	65.725
2012-01-01	66.325
2013-01-01	66.950
2014-01-01	67.100
2015-01-01	67.325
2016-01-01	67.625
2017-01-01	67.575