Year	Percent
2003-01-01	81.325
2004-01-01	80.200
2005-01-01	81.350
2006-01-01	82.475
2007-01-01	82.675
2008-01-01	81.900
2009-01-01	80.350
2010-01-01	80.375
2011-01-01	79.775
2012-01-01	79.875
2013-01-01	80.650
2014-01-01	82.150
2015-01-01	83.000
2016-01-01	83.800
2017-01-01	82.900