Year	Percent
1999-01-01	93.850
2000-01-01	94.000
2001-01-01	93.650
2002-01-01	94.250
2003-01-01	94.625
2004-01-01	92.050
2005-01-01	92.000
2006-01-01	92.175
2007-01-01	92.550
2008-01-01	92.100
2009-01-01	91.925
2010-01-01	91.925
2011-01-01	91.975
2012-01-01	92.275
2013-01-01	92.100
2014-01-01	91.425
2015-01-01	91.625
2016-01-01	91.775
2017-01-01	92.250