Year	Percent
1999-01-01	5.175
2000-01-01	4.350
2001-01-01	4.250
2002-01-01	4.200
2003-01-01	4.875
2004-01-01	5.575
2005-01-01	5.150
2006-01-01	3.900
2007-01-01	3.400
2008-01-01	2.600
2009-01-01	4.125
2010-01-01	5.450
2011-01-01	5.750
2012-01-01	5.475
2013-01-01	5.150
2014-01-01	4.825
2015-01-01	4.350
2016-01-01	4.025
2017-01-01	3.725