Year	Percent
2005-01-01	87.400
2006-01-01	87.800
2007-01-01	88.200
2008-01-01	88.000
2009-01-01	87.800
2010-01-01	87.225
2011-01-01	87.750
2012-01-01	87.750
2013-01-01	87.625
2014-01-01	87.600
2015-01-01	87.850
2016-01-01	88.175
2017-01-01	88.475