Year	Percent
1998-01-01	5.450
1999-01-01	7.500
2000-01-01	7.725
2001-01-01	7.150
2002-01-01	6.475
2003-01-01	6.975
2004-01-01	7.300
2005-01-01	7.125
2006-01-01	6.350
2007-01-01	4.925
2008-01-01	3.975
2009-01-01	5.925
2010-01-01	6.450
2011-01-01	5.950
2012-01-01	6.125
2013-01-01	6.200
2014-01-01	5.600
2015-01-01	4.625
2016-01-01	3.550
2017-01-01	2.675