Year	Percent
1998-01-01	5.725
1999-01-01	4.850
2000-01-01	4.475
2001-01-01	4.500
2002-01-01	5.550
2003-01-01	6.750
2004-01-01	7.050
2005-01-01	8.450
2006-01-01	8.975
2007-01-01	9.550
2008-01-01	8.550
2009-01-01	10.050
2010-01-01	12.150
2011-01-01	12.300
2012-01-01	14.725
2013-01-01	15.575
2014-01-01	13.400
2015-01-01	11.550
2016-01-01	10.425
2017-01-01	8.475