Year	Percent
2000-01-01	57.675
2001-01-01	56.550
2002-01-01	56.825
2003-01-01	55.150
2004-01-01	54.575
2005-01-01	53.425
2006-01-01	52.425
2007-01-01	54.450
2008-01-01	57.325
2009-01-01	52.575
2010-01-01	51.450
2011-01-01	50.825
2012-01-01	52.200
2013-01-01	51.800
2014-01-01	50.150
2015-01-01	50.375
2016-01-01	48.475
2017-01-01	48.200