Year	Percent
1998-01-01	6.950
1999-01-01	6.750
2000-01-01	6.300
2001-01-01	5.800
2002-01-01	5.575
2003-01-01	5.425
2004-01-01	5.200
2005-01-01	5.075
2006-01-01	4.500
2007-01-01	4.025
2008-01-01	4.650
2009-01-01	5.825
2010-01-01	6.500
2011-01-01	6.475
2012-01-01	8.575
2013-01-01	10.350
2014-01-01	10.825
2015-01-01	10.375
2016-01-01	10.075
2017-01-01	9.725