Year	Percent
1999-01-01	64.300
2000-01-01	64.200
2001-01-01	64.850
2002-01-01	64.125
2003-01-01	63.450
2004-01-01	65.850
2005-01-01	65.975
2006-01-01	65.650
2007-01-01	66.375
2008-01-01	65.625
2009-01-01	65.450
2010-01-01	65.250
2011-01-01	63.700
2012-01-01	63.025
2013-01-01	63.075
2014-01-01	63.300
2015-01-01	62.925
2016-01-01	61.325
2017-01-01	63.175