Year	Percent
2000-01-01	56.600
2001-01-01	57.000
2002-01-01	57.450
2003-01-01	58.950
2004-01-01	58.475
2005-01-01	58.975
2006-01-01	63.450
2007-01-01	64.650
2008-01-01	64.800
2009-01-01	56.625
2010-01-01	54.025
2011-01-01	59.125
2012-01-01	60.900
2013-01-01	62.150
2014-01-01	63.475
2015-01-01	65.150
2016-01-01	65.275
2017-01-01	66.975