Year	Percent
1999-01-01	5.900
2000-01-01	5.375
2001-01-01	4.475
2002-01-01	4.925
2003-01-01	5.425
2004-01-01	5.050
2005-01-01	5.175
2006-01-01	4.350
2007-01-01	3.450
2008-01-01	3.275
2009-01-01	5.300
2010-01-01	7.100
2011-01-01	7.650
2012-01-01	7.575
2013-01-01	8.900
2014-01-01	8.275
2015-01-01	7.300
2016-01-01	6.875
2017-01-01	5.200