Year	Percent
1996-01-01	3.9583600000000000
1997-01-01	4.4440300000000010
1998-01-01	4.1200500000000000
1999-01-01	3.9094700000000000
2000-01-01	4.3009300000000000
2001-01-01	4.0548100000000000
2002-01-01	3.9604600000000000
2003-01-01	4.0775500000000000
2004-01-01	3.6810900000000000
2005-01-01	3.3796100000000000
2006-01-01	3.6170199999999997
2007-01-01	3.4483500000000000
2008-01-01	3.4928400000000000
2009-01-01	3.3961200000000000
2010-01-01	3.4474400000000003
2011-01-01	3.6890800000000000
2012-01-01	3.3832400000000002
2013-01-01	3.2364400000000000
2014-01-01	2.9873000000000000
2015-01-01	2.8924900000000000
2016-01-01	3.4304300000000003