Year	Percent
2003-01-01	79.975
2004-01-01	80.475
2005-01-01	80.900
2006-01-01	81.300
2007-01-01	81.975
2008-01-01	82.775
2009-01-01	83.075
2010-01-01	83.350
2011-01-01	82.975
2012-01-01	83.025
2013-01-01	83.450
2014-01-01	83.000
2015-01-01	82.675
2016-01-01	82.725
2017-01-01	82.450