Year	Percent
1999-01-01	65.975
2000-01-01	65.525
2001-01-01	65.950
2002-01-01	65.500
2003-01-01	65.525
2004-01-01	66.050
2005-01-01	65.650
2006-01-01	65.925
2007-01-01	65.700
2008-01-01	66.000
2009-01-01	65.350
2010-01-01	64.375
2011-01-01	63.925
2012-01-01	63.125
2013-01-01	62.350
2014-01-01	62.175
2015-01-01	62.225
2016-01-01	63.575
2017-01-01	62.250