Year	Percent
2000-01-01	73.325
2001-01-01	71.575
2002-01-01	69.400
2003-01-01	67.425
2004-01-01	65.600
2005-01-01	63.525
2006-01-01	61.450
2007-01-01	58.600
2008-01-01	56.500
2009-01-01	54.000
2010-01-01	55.525
2011-01-01	51.775
2012-01-01	49.025
2013-01-01	47.225
2014-01-01	45.675
2015-01-01	43.325
2016-01-01	41.425
2017-01-01	39.875