Year	Percent
1999-01-01	68.300
2000-01-01	68.475
2001-01-01	64.550
2002-01-01	65.525
2003-01-01	61.500
2004-01-01	63.475
2005-01-01	63.975
2006-01-01	64.975
2007-01-01	66.550
2008-01-01	67.425
2009-01-01	62.250
2010-01-01	56.700
2011-01-01	56.575
2012-01-01	54.625
2013-01-01	52.350
2014-01-01	52.650
2015-01-01	54.575
2016-01-01	56.500
2017-01-01	55.325