Year	Percent
2000-01-01	64.250
2001-01-01	63.025
2002-01-01	61.850
2003-01-01	62.100
2004-01-01	62.550
2005-01-01	63.125
2006-01-01	65.325
2007-01-01	68.775
2008-01-01	71.025
2009-01-01	71.575
2010-01-01	71.725
2011-01-01	71.450
2012-01-01	71.450
2013-01-01	71.175
2014-01-01	72.700
2015-01-01	73.925
2016-01-01	74.475
2017-01-01	75.275