Year	Percent
1999-01-01	75.425
2000-01-01	75.675
2001-01-01	74.525
2002-01-01	73.075
2003-01-01	71.525
2004-01-01	68.325
2005-01-01	65.000
2006-01-01	63.325
2007-01-01	61.200
2008-01-01	58.100
2009-01-01	57.175
2010-01-01	54.925
2011-01-01	54.050
2012-01-01	51.500
2013-01-01	50.525
2014-01-01	49.925
2015-01-01	48.200
2016-01-01	46.125
2017-01-01	43.650