Year	Percent
2003-01-01	80.400
2004-01-01	83.000
2005-01-01	83.900
2006-01-01	84.500
2007-01-01	84.750
2008-01-01	83.425
2009-01-01	84.750
2010-01-01	85.675
2011-01-01	85.600
2012-01-01	87.025
2013-01-01	87.550
2014-01-01	88.025
2015-01-01	87.700
2016-01-01	87.175
2017-01-01	87.975