Year	Percent
1999-01-01	6.350
2000-01-01	5.050
2001-01-01	4.300
2002-01-01	4.750
2003-01-01	5.350
2004-01-01	5.625
2005-01-01	5.825
2006-01-01	4.300
2007-01-01	3.950
2008-01-01	2.825
2009-01-01	3.350
2010-01-01	3.950
2011-01-01	4.725
2012-01-01	5.275
2013-01-01	5.050
2014-01-01	4.525
2015-01-01	4.800
2016-01-01	4.100
2017-01-01	3.600