Year	Percent
2000-01-01	58.525
2001-01-01	58.425
2002-01-01	57.600
2003-01-01	58.925
2004-01-01	59.300
2005-01-01	59.950
2006-01-01	61.550
2007-01-01	60.975
2008-01-01	62.025
2009-01-01	62.125
2010-01-01	62.725
2011-01-01	63.675
2012-01-01	63.675
2013-01-01	64.075
2014-01-01	63.475
2015-01-01	65.375
2016-01-01	66.100
2017-01-01	67.275