Year	Percent
1998-01-01	9.525
1999-01-01	8.425
2000-01-01	8.000
2001-01-01	7.400
2002-01-01	7.325
2003-01-01	7.250
2004-01-01	7.250
2005-01-01	6.775
2006-01-01	6.100
2007-01-01	5.325
2008-01-01	4.875
2009-01-01	6.600
2010-01-01	6.825
2011-01-01	6.150
2012-01-01	6.125
2013-01-01	6.575
2014-01-01	7.100
2015-01-01	7.725
2016-01-01	7.425
2017-01-01	7.075