Year	Percent
1998-01-01	6.475
1999-01-01	8.750
2000-01-01	8.850
2001-01-01	8.175
2002-01-01	7.325
2003-01-01	7.825
2004-01-01	8.325
2005-01-01	7.950
2006-01-01	7.150
2007-01-01	5.325
2008-01-01	4.400
2009-01-01	6.675
2010-01-01	7.300
2011-01-01	6.700
2012-01-01	7.000
2013-01-01	6.975
2014-01-01	6.100
2015-01-01	5.050
2016-01-01	3.975
2017-01-01	2.925