Year	Percent
2000-01-01	59.600
2001-01-01	60.450
2002-01-01	61.250
2003-01-01	60.325
2004-01-01	60.950
2005-01-01	59.150
2006-01-01	57.500
2007-01-01	55.250
2008-01-01	53.250
2009-01-01	52.525
2010-01-01	51.100
2011-01-01	48.400
2012-01-01	46.475
2013-01-01	44.075
2014-01-01	42.800
2015-01-01	42.450
2016-01-01	41.350
2017-01-01	39.200