Year	Percent
2003-01-01	86.800
2004-01-01	87.100
2005-01-01	87.275
2006-01-01	87.575
2007-01-01	87.950
2008-01-01	88.500
2009-01-01	88.600
2010-01-01	88.675
2011-01-01	88.250
2012-01-01	88.175
2013-01-01	88.300
2014-01-01	87.850
2015-01-01	87.475
2016-01-01	87.500
2017-01-01	87.425