Year	Percent
2000-01-01	72.275
2001-01-01	71.625
2002-01-01	71.650
2003-01-01	72.525
2004-01-01	72.175
2005-01-01	72.125
2006-01-01	74.000
2007-01-01	74.625
2008-01-01	75.000
2009-01-01	73.900
2010-01-01	73.525
2011-01-01	73.900
2012-01-01	75.925
2013-01-01	75.950
2014-01-01	76.975
2015-01-01	76.900
2016-01-01	77.725
2017-01-01	76.975