Year	Percent
2003-01-01	82.250
2004-01-01	82.000
2005-01-01	83.275
2006-01-01	84.600
2007-01-01	85.275
2008-01-01	83.675
2009-01-01	76.900
2010-01-01	76.950
2011-01-01	76.700
2012-01-01	77.400
2013-01-01	78.950
2014-01-01	81.325
2015-01-01	82.900
2016-01-01	85.175
2017-01-01	84.275