Year	Percent
2000-01-01	58.150
2001-01-01	57.325
2002-01-01	55.725
2003-01-01	56.025
2004-01-01	55.900
2005-01-01	56.600
2006-01-01	59.275
2007-01-01	74.475
2008-01-01	70.025
2009-01-01	62.750
2010-01-01	56.000
2011-01-01	53.575
2012-01-01	51.900
2013-01-01	51.625
2014-01-01	50.175
2015-01-01	50.150
2016-01-01	52.675
2017-01-01	47.875