Year	Percent
2000-01-01	77.625
2001-01-01	75.375
2002-01-01	73.000
2003-01-01	72.950
2004-01-01	73.900
2005-01-01	76.075
2006-01-01	78.300
2007-01-01	81.150
2008-01-01	84.000
2009-01-01	83.725
2010-01-01	82.525
2011-01-01	83.000
2012-01-01	82.900
2013-01-01	82.675
2014-01-01	83.925
2015-01-01	84.950
2016-01-01	86.100
2017-01-01	87.350