Year	Percent
2000-01-01	92.000
2001-01-01	91.850
2002-01-01	91.175
2003-01-01	91.050
2004-01-01	91.775
2005-01-01	92.125
2006-01-01	92.125
2007-01-01	91.600
2008-01-01	91.350
2009-01-01	89.775
2010-01-01	88.900
2011-01-01	88.350
2012-01-01	88.650
2013-01-01	88.850
2014-01-01	89.450
2015-01-01	89.550
2016-01-01	89.250
2017-01-01	90.050