Year	Percent
1995-01-01	3.3804100000000000
1996-01-01	3.2632000000000000
1997-01-01	3.2891800000000004
1998-01-01	3.2489500000000000
1999-01-01	2.9302400000000000
2000-01-01	2.7207800000000000
2001-01-01	2.7099200000000000
2002-01-01	3.5005500000000000
2003-01-01	3.5392900000000003
2004-01-01	3.3939300000000000
2005-01-01	3.2103400000000000
2006-01-01	3.1751800000000000
2007-01-01	2.8944700000000000
2008-01-01	2.9187300000000000
2009-01-01	3.2262200000000000
2010-01-01	3.1068900000000000
2011-01-01	2.9545000000000000
2012-01-01	2.9668900000000002
2013-01-01	3.0457099999999997
2014-01-01	2.8067000000000000
2015-01-01	2.8235300000000000
2016-01-01	2.9283700000000000
2017-01-01	2.7779800000000000