Year	Percent
1998-01-01	4.125
1999-01-01	4.000
2000-01-01	3.250
2001-01-01	3.175
2002-01-01	4.200
2003-01-01	5.550
2004-01-01	5.900
2005-01-01	6.775
2006-01-01	6.625
2007-01-01	6.700
2008-01-01	6.600
2009-01-01	9.000
2010-01-01	9.950
2011-01-01	12.600
2012-01-01	15.900
2013-01-01	16.350
2014-01-01	13.750
2015-01-01	12.350
2016-01-01	11.150
2017-01-01	8.550