Year	Percent
2000-01-01	89.825
2001-01-01	89.425
2002-01-01	88.475
2003-01-01	88.100
2004-01-01	88.350
2005-01-01	88.400
2006-01-01	92.650
2007-01-01	93.500
2008-01-01	92.775
2009-01-01	91.900
2010-01-01	91.800
2011-01-01	92.075
2012-01-01	92.075
2013-01-01	92.375
2014-01-01	92.200
2015-01-01	92.650
2016-01-01	93.700
2017-01-01	93.325