Year	Percent
1998-01-01	5.100
1999-01-01	4.575
2000-01-01	4.075
2001-01-01	4.075
2002-01-01	5.075
2003-01-01	6.350
2004-01-01	6.700
2005-01-01	7.700
2006-01-01	7.775
2007-01-01	8.100
2008-01-01	7.700
2009-01-01	9.600
2010-01-01	10.975
2011-01-01	12.900
2012-01-01	15.775
2013-01-01	16.450
2014-01-01	14.075
2015-01-01	12.625
2016-01-01	11.225
2017-01-01	9.000