Year	Percent
1999-01-01	65.450
2000-01-01	65.975
2001-01-01	62.275
2002-01-01	63.525
2003-01-01	59.575
2004-01-01	62.300
2005-01-01	62.275
2006-01-01	64.550
2007-01-01	65.325
2008-01-01	66.400
2009-01-01	62.525
2010-01-01	58.050
2011-01-01	57.550
2012-01-01	55.000
2013-01-01	53.675
2014-01-01	53.750
2015-01-01	55.350
2016-01-01	58.250
2017-01-01	56.250