Year	Percent
1999-01-01	84.325
2000-01-01	84.425
2001-01-01	84.200
2002-01-01	84.325
2003-01-01	84.825
2004-01-01	84.975
2005-01-01	85.500
2006-01-01	86.925
2007-01-01	87.200
2008-01-01	87.350
2009-01-01	87.100
2010-01-01	87.300
2011-01-01	88.225
2012-01-01	89.400
2013-01-01	89.500
2014-01-01	91.225
2015-01-01	91.975
2016-01-01	92.350
2017-01-01	93.250