Year	Percent
1986-01-01	3.8511200000000000
1987-01-01	3.4831900000000000
1988-01-01	3.0948000000000000
1989-01-01	3.0074000000000000
1990-01-01	2.7277900000000000
1991-01-01	0.6327810000000000
1992-01-01	0.5437450000000000
1993-01-01	2.1730600000000000
1994-01-01	2.0270700000000000
1995-01-01	0.5774199999999999
1996-01-01	1.4108100000000001
1997-01-01	1.4012300000000000
1998-01-01	2.5768100000000000
1999-01-01	2.4007400000000003
2000-01-01	2.0891100000000000
2001-01-01	2.9568500000000000
2002-01-01	1.7483300000000000
2003-01-01	1.9134400000000003
2004-01-01	1.9141000000000000
2005-01-01	1.7908099999999998
2006-01-01	1.6703200000000000
2007-01-01	1.5848200000000001
2008-01-01	1.5951400000000000
2009-01-01	1.6874600000000000
2010-01-01	1.7525600000000000
2011-01-01	1.7768700000000002
2012-01-01	1.7216500000000000
2013-01-01	1.7710500000000000
2014-01-01	2.2444800000000000
2015-01-01	2.1211100000000000
2016-01-01	2.0144200000000000
2017-01-01	2.0222500000000000