Year	Percent
2000-01-01	77.525
2001-01-01	77.475
2002-01-01	77.050
2003-01-01	76.075
2004-01-01	75.900
2005-01-01	75.800
2006-01-01	75.400
2007-01-01	75.825
2008-01-01	76.850
2009-01-01	75.500
2010-01-01	74.875
2011-01-01	73.950
2012-01-01	74.275
2013-01-01	73.725
2014-01-01	73.450
2015-01-01	73.750
2016-01-01	73.275
2017-01-01	72.275