Year	Percent
1999-01-01	62.700
2000-01-01	63.275
2001-01-01	60.000
2002-01-01	61.425
2003-01-01	57.675
2004-01-01	61.100
2005-01-01	60.550
2006-01-01	64.150
2007-01-01	64.000
2008-01-01	65.225
2009-01-01	62.825
2010-01-01	59.500
2011-01-01	58.575
2012-01-01	55.400
2013-01-01	55.050
2014-01-01	54.875
2015-01-01	56.200
2016-01-01	60.000
2017-01-01	57.275