Year	Percent
1999-01-01	66.925
2000-01-01	66.575
2001-01-01	66.050
2002-01-01	65.475
2003-01-01	65.550
2004-01-01	62.725
2005-01-01	62.800
2006-01-01	63.425
2007-01-01	64.525
2008-01-01	64.850
2009-01-01	63.625
2010-01-01	63.775
2011-01-01	63.875
2012-01-01	63.625
2013-01-01	63.350
2014-01-01	62.575
2015-01-01	62.350
2016-01-01	62.475
2017-01-01	62.825