Year	Percent
2000-01-01	50.725
2001-01-01	52.250
2002-01-01	53.425
2003-01-01	55.350
2004-01-01	56.150
2005-01-01	56.825
2006-01-01	57.300
2007-01-01	57.375
2008-01-01	57.950
2009-01-01	57.525
2010-01-01	57.150
2011-01-01	56.675
2012-01-01	58.075
2013-01-01	59.775
2014-01-01	60.950
2015-01-01	62.200
2016-01-01	63.375
2017-01-01	64.050