Year	Percent
1998-01-01	6.475
1999-01-01	8.800
2000-01-01	8.875
2001-01-01	8.200
2002-01-01	7.350
2003-01-01	7.875
2004-01-01	8.400
2005-01-01	7.950
2006-01-01	7.200
2007-01-01	5.375
2008-01-01	4.425
2009-01-01	6.725
2010-01-01	7.375
2011-01-01	6.800
2012-01-01	7.050
2013-01-01	7.025
2014-01-01	6.200
2015-01-01	5.100
2016-01-01	4.000
2017-01-01	2.925