Year	Percent
2003-01-01	64.600
2004-01-01	65.800
2005-01-01	66.600
2006-01-01	66.700
2007-01-01	66.875
2008-01-01	66.825
2009-01-01	68.725
2010-01-01	68.200
2011-01-01	67.950
2012-01-01	69.425
2013-01-01	69.850
2014-01-01	70.800
2015-01-01	70.875
2016-01-01	69.975
2017-01-01	70.175