Year	Percent
2001-01-01	85.500
2002-01-01	85.500
2003-01-01	85.425
2004-01-01	85.250
2005-01-01	85.875
2006-01-01	86.250
2007-01-01	87.075
2008-01-01	87.575
2009-01-01	87.150
2010-01-01	86.625
2011-01-01	87.325
2012-01-01	87.575
2013-01-01	88.125
2014-01-01	87.975
2015-01-01	88.375
2016-01-01	88.450
2017-01-01	88.750