Year	Percent
2003-01-01	77.800
2004-01-01	79.300
2005-01-01	80.700
2006-01-01	81.000
2007-01-01	81.875
2008-01-01	79.950
2009-01-01	81.200
2010-01-01	82.325
2011-01-01	81.950
2012-01-01	83.100
2013-01-01	82.900
2014-01-01	83.750
2015-01-01	82.600
2016-01-01	82.525
2017-01-01	83.650