Year	Percent
1998-01-01	9.150
1999-01-01	8.800
2000-01-01	8.150
2001-01-01	7.375
2002-01-01	6.975
2003-01-01	6.775
2004-01-01	6.350
2005-01-01	6.175
2006-01-01	5.425
2007-01-01	4.875
2008-01-01	5.500
2009-01-01	6.725
2010-01-01	7.500
2011-01-01	7.525
2012-01-01	9.825
2013-01-01	11.500
2014-01-01	11.900
2015-01-01	11.350
2016-01-01	10.950
2017-01-01	10.375