Year	Percent
2003-01-01	83.000
2004-01-01	81.750
2005-01-01	84.300
2006-01-01	84.350
2007-01-01	84.675
2008-01-01	82.925
2009-01-01	80.200
2010-01-01	79.825
2011-01-01	79.175
2012-01-01	79.075
2013-01-01	81.150
2014-01-01	84.800
2015-01-01	84.725
2016-01-01	84.575
2017-01-01	83.875