Year	Percent
2000-01-01	50.725
2001-01-01	51.100
2002-01-01	51.650
2003-01-01	52.850
2004-01-01	52.900
2005-01-01	54.000
2006-01-01	57.025
2007-01-01	57.750
2008-01-01	57.775
2009-01-01	52.500
2010-01-01	50.375
2011-01-01	53.775
2012-01-01	55.150
2013-01-01	56.050
2014-01-01	56.625
2015-01-01	58.275
2016-01-01	58.625
2017-01-01	59.975