Year	Percent
1999-01-01	65.400
2000-01-01	65.575
2001-01-01	65.150
2002-01-01	65.150
2003-01-01	64.900
2004-01-01	65.400
2005-01-01	66.000
2006-01-01	65.700
2007-01-01	66.125
2008-01-01	65.950
2009-01-01	65.550
2010-01-01	66.025
2011-01-01	64.925
2012-01-01	64.975
2013-01-01	64.975
2014-01-01	64.650
2015-01-01	64.275
2016-01-01	64.125
2017-01-01	64.350