Year	Percent
1998-01-01	3.950
1999-01-01	5.850
2000-01-01	5.950
2001-01-01	5.500
2002-01-01	4.875
2003-01-01	5.000
2004-01-01	5.650
2005-01-01	5.275
2006-01-01	4.700
2007-01-01	3.475
2008-01-01	2.775
2009-01-01	4.800
2010-01-01	5.225
2011-01-01	4.625
2012-01-01	4.775
2013-01-01	4.875
2014-01-01	4.350
2015-01-01	3.750
2016-01-01	2.800
2017-01-01	2.050