Year	Percent
1998-01-01	7.250
1999-01-01	9.425
2000-01-01	9.825
2001-01-01	9.100
2002-01-01	8.325
2003-01-01	9.300
2004-01-01	9.300
2005-01-01	9.325
2006-01-01	8.300
2007-01-01	6.675
2008-01-01	5.425
2009-01-01	7.300
2010-01-01	8.025
2011-01-01	7.575
2012-01-01	7.775
2013-01-01	7.875
2014-01-01	7.150
2015-01-01	5.775
2016-01-01	4.450
2017-01-01	3.450