Year	Percent
2003-01-01	86.725
2004-01-01	84.475
2005-01-01	84.325
2006-01-01	84.800
2007-01-01	84.200
2008-01-01	83.400
2009-01-01	83.925
2010-01-01	84.300
2011-01-01	84.675
2012-01-01	85.375
2013-01-01	85.525
2014-01-01	86.925
2015-01-01	87.900
2016-01-01	88.900
2017-01-01	88.700