Year	Percent
1999-01-01	58.725
2000-01-01	60.850
2001-01-01	62.850
2002-01-01	63.400
2003-01-01	64.775
2004-01-01	59.650
2005-01-01	59.475
2006-01-01	59.375
2007-01-01	58.175
2008-01-01	57.125
2009-01-01	59.150
2010-01-01	60.075
2011-01-01	62.600
2012-01-01	65.625
2013-01-01	66.150
2014-01-01	66.400
2015-01-01	64.650
2016-01-01	66.275
2017-01-01	60.850