Year	Percent
2000-01-01	92.200
2001-01-01	92.725
2002-01-01	91.800
2003-01-01	90.550
2004-01-01	90.225
2005-01-01	90.300
2006-01-01	91.350
2007-01-01	92.150
2008-01-01	92.950
2009-01-01	91.975
2010-01-01	90.025
2011-01-01	89.850
2012-01-01	89.050
2013-01-01	86.850
2014-01-01	86.850
2015-01-01	87.500
2016-01-01	88.100
2017-01-01	88.375