Year	Percent
1998-01-01	4.400
1999-01-01	3.600
2000-01-01	2.950
2001-01-01	2.250
2002-01-01	2.750
2003-01-01	3.700
2004-01-01	4.575
2005-01-01	4.725
2006-01-01	3.900
2007-01-01	3.175
2008-01-01	2.750
2009-01-01	3.450
2010-01-01	4.450
2011-01-01	4.975
2012-01-01	5.850
2013-01-01	7.250
2014-01-01	7.425
2015-01-01	6.900
2016-01-01	6.000
2017-01-01	4.850