Year	Percent
1998-01-01	13.050
1999-01-01	9.475
2000-01-01	9.125
2001-01-01	8.975
2002-01-01	7.775
2003-01-01	7.550
2004-01-01	7.075
2005-01-01	6.575
2006-01-01	6.675
2007-01-01	5.875
2008-01-01	5.000
2009-01-01	5.475
2010-01-01	5.700
2011-01-01	5.300
2012-01-01	5.125
2013-01-01	5.850
2014-01-01	6.300
2015-01-01	7.000
2016-01-01	6.900
2017-01-01	7.000