Year	Percent
1998-01-01	5.100
1999-01-01	7.425
2000-01-01	7.500
2001-01-01	6.850
2002-01-01	5.975
2003-01-01	6.200
2004-01-01	7.125
2005-01-01	6.500
2006-01-01	5.850
2007-01-01	4.275
2008-01-01	3.500
2009-01-01	5.950
2010-01-01	6.500
2011-01-01	5.875
2012-01-01	6.075
2013-01-01	6.000
2014-01-01	5.175
2015-01-01	4.300
2016-01-01	3.450
2017-01-01	2.350