Year	Percent
2000-01-01	73.200
2001-01-01	73.350
2002-01-01	73.350
2003-01-01	72.475
2004-01-01	72.275
2005-01-01	72.175
2006-01-01	71.825
2007-01-01	72.650
2008-01-01	73.775
2009-01-01	72.625
2010-01-01	71.800
2011-01-01	71.325
2012-01-01	71.425
2013-01-01	71.075
2014-01-01	64.850
2015-01-01	64.950
2016-01-01	64.525
2017-01-01	63.725