Year	Percent
1998-01-01	5.100
1999-01-01	7.375
2000-01-01	7.450
2001-01-01	6.800
2002-01-01	5.975
2003-01-01	6.150
2004-01-01	7.075
2005-01-01	6.500
2006-01-01	5.825
2007-01-01	4.225
2008-01-01	3.475
2009-01-01	5.850
2010-01-01	6.400
2011-01-01	5.825
2012-01-01	6.025
2013-01-01	5.925
2014-01-01	5.125
2015-01-01	4.225
2016-01-01	3.375
2017-01-01	2.350