Year	Percent
1990-01-01	1.5684600000000000
1991-01-01	1.6693099999999998
1992-01-01	1.8079400000000000
1993-01-01	1.7373400000000000
1994-01-01	1.8637800000000000
1995-01-01	1.8999599999999999
1996-01-01	2.0117700000000003
1997-01-01	1.8974400000000002
1998-01-01	1.7562799999999998
1999-01-01	1.6581800000000000
2000-01-01	1.5086700000000002
2001-01-01	1.6497900000000000
2002-01-01	1.7457099999999999
2003-01-01	1.7616100000000000
2004-01-01	1.6113700000000000
2005-01-01	1.5495299999999999
2006-01-01	1.4321500000000000
2007-01-01	1.3865700000000000
2008-01-01	1.2884500000000000
2009-01-01	1.4630800000000000
2010-01-01	1.3728100000000000
2011-01-01	1.3223200000000002
2012-01-01	1.3520100000000000
2013-01-01	1.3739299999999999
2014-01-01	1.3399700000000000
2015-01-01	1.3151500000000000
2016-01-01	1.2484600000000001