Year	Percent
1999-01-01	9.400
2000-01-01	9.400
2001-01-01	8.900
2002-01-01	8.775
2003-01-01	9.425
2004-01-01	9.050
2005-01-01	8.900
2006-01-01	8.950
2007-01-01	8.725
2008-01-01	8.400
2009-01-01	8.775
2010-01-01	8.250
2011-01-01	8.150
2012-01-01	7.650
2013-01-01	7.400
2014-01-01	7.750
2015-01-01	7.125
2016-01-01	8.025
2017-01-01	6.650