Year	Percent
1999-01-01	93.675
2000-01-01	93.850
2001-01-01	93.975
2002-01-01	93.400
2003-01-01	94.150
2004-01-01	93.775
2005-01-01	93.800
2006-01-01	93.975
2007-01-01	93.100
2008-01-01	93.375
2009-01-01	93.550
2010-01-01	92.925
2011-01-01	93.475
2012-01-01	93.725
2013-01-01	93.625
2014-01-01	94.050
2015-01-01	93.625
2016-01-01	93.500
2017-01-01	93.125