Year	Percent
2003-01-01	63.800
2004-01-01	66.200
2005-01-01	68.400
2006-01-01	69.500
2007-01-01	71.700
2008-01-01	69.550
2009-01-01	71.400
2010-01-01	72.575
2011-01-01	72.850
2012-01-01	74.975
2013-01-01	75.500
2014-01-01	76.800
2015-01-01	75.750
2016-01-01	76.350
2017-01-01	79.800