Year	Percent
2000-01-01	63.225
2001-01-01	64.600
2002-01-01	64.975
2003-01-01	64.575
2004-01-01	65.025
2005-01-01	65.675
2006-01-01	66.900
2007-01-01	67.525
2008-01-01	66.000
2009-01-01	60.675
2010-01-01	57.700
2011-01-01	56.675
2012-01-01	55.425
2013-01-01	58.800
2014-01-01	60.850
2015-01-01	64.500
2016-01-01	65.400
2017-01-01	66.775