Year	Percent
2001-01-01	72.900
2002-01-01	72.550
2003-01-01	72.350
2004-01-01	72.125
2005-01-01	73.300
2006-01-01	73.800
2007-01-01	73.975
2008-01-01	74.150
2009-01-01	73.525
2010-01-01	73.900
2011-01-01	73.925
2012-01-01	73.950
2013-01-01	74.250
2014-01-01	74.725
2015-01-01	74.425
2016-01-01	74.450
2017-01-01	75.125