Year	Percent
2003-01-01	79.900
2004-01-01	78.600
2005-01-01	81.275
2006-01-01	81.225
2007-01-01	80.575
2008-01-01	77.675
2009-01-01	77.675
2010-01-01	79.075
2011-01-01	79.150
2012-01-01	77.975
2013-01-01	77.750
2014-01-01	83.375
2015-01-01	83.250
2016-01-01	80.500
2017-01-01	79.925