Year	Percent
1998-01-01	9.725
1999-01-01	9.525
2000-01-01	9.425
2001-01-01	9.250
2002-01-01	8.975
2003-01-01	8.550
2004-01-01	8.475
2005-01-01	8.725
2006-01-01	8.650
2007-01-01	9.000
2008-01-01	8.975
2009-01-01	10.000
2010-01-01	10.575
2011-01-01	10.775
2012-01-01	10.625
2013-01-01	11.675
2014-01-01	12.300
2015-01-01	12.275
2016-01-01	11.775
2017-01-01	11.500