Year	Percent
1999-01-01	62.850
2000-01-01	63.625
2001-01-01	64.200
2002-01-01	64.125
2003-01-01	63.075
2004-01-01	63.975
2005-01-01	64.125
2006-01-01	65.250
2007-01-01	65.000
2008-01-01	65.500
2009-01-01	64.050
2010-01-01	62.350
2011-01-01	61.525
2012-01-01	60.950
2013-01-01	60.600
2014-01-01	60.425
2015-01-01	60.475
2016-01-01	62.150
2017-01-01	61.475