Year	Percent
2000-01-01	74.850
2001-01-01	74.725
2002-01-01	74.050
2003-01-01	72.775
2004-01-01	72.400
2005-01-01	72.350
2006-01-01	72.800
2007-01-01	73.875
2008-01-01	74.800
2009-01-01	72.800
2010-01-01	71.875
2011-01-01	71.425
2012-01-01	71.675
2013-01-01	71.075
2014-01-01	64.325
2015-01-01	64.525
2016-01-01	63.300
2017-01-01	62.900