Year	Percent
2000-01-01	57.150
2001-01-01	56.025
2002-01-01	54.400
2003-01-01	52.775
2004-01-01	52.150
2005-01-01	51.125
2006-01-01	49.850
2007-01-01	50.050
2008-01-01	49.800
2009-01-01	49.350
2010-01-01	48.875
2011-01-01	48.725
2012-01-01	47.025
2013-01-01	44.725
2014-01-01	43.600
2015-01-01	42.300
2016-01-01	40.750
2017-01-01	39.100