Year	Percent
2000-01-01	71.725
2001-01-01	71.450
2002-01-01	70.625
2003-01-01	69.950
2004-01-01	70.150
2005-01-01	70.775
2006-01-01	70.075
2007-01-01	70.000
2008-01-01	70.900
2009-01-01	71.775
2010-01-01	72.125
2011-01-01	72.650
2012-01-01	73.275
2013-01-01	73.875
2014-01-01	74.650
2015-01-01	74.800
2016-01-01	75.650
2017-01-01	76.600