Year	Percent
2001-01-01	90.400
2002-01-01	89.800
2003-01-01	89.925
2004-01-01	89.975
2005-01-01	91.675
2006-01-01	92.525
2007-01-01	92.850
2008-01-01	93.100
2009-01-01	92.850
2010-01-01	92.950
2011-01-01	93.175
2012-01-01	93.525
2013-01-01	93.575
2014-01-01	93.500
2015-01-01	93.375
2016-01-01	93.325
2017-01-01	93.625