Year	Percent
2000-01-01	54.975
2001-01-01	53.350
2002-01-01	51.475
2003-01-01	51.200
2004-01-01	51.650
2005-01-01	52.775
2006-01-01	54.450
2007-01-01	57.025
2008-01-01	59.225
2009-01-01	59.375
2010-01-01	58.950
2011-01-01	59.300
2012-01-01	59.675
2013-01-01	60.000
2014-01-01	61.675
2015-01-01	62.925
2016-01-01	64.500
2017-01-01	66.125