Year	Percent
1980-01-01	1.1704800000000000
1981-01-01	1.4060100000000000
1982-01-01	1.3036000000000000
1983-01-01	1.3056500000000000
1984-01-01	1.3671900000000000
1985-01-01	1.0022600000000000
1986-01-01	8.3965300000000000
1987-01-01	8.0335800000000000
1988-01-01	7.3383300000000000
1989-01-01	10.3771000000000000
1990-01-01	9.2388300000000000
1991-01-01	0.7093970000000000
1992-01-01	0.6424810000000001
1993-01-01	6.0567400000000005
1994-01-01	6.3421400000000006
1995-01-01	6.1815000000000000
1996-01-01	5.9527800000000010
1997-01-01	5.5228300000000000
1998-01-01	5.8887800000000010
1999-01-01	5.9404100000000000
2000-01-01	5.7724600000000000
2001-01-01	5.3698600000000000
2002-01-01	5.2547100000000000
2003-01-01	5.7551500000000000
2004-01-01	5.6604700000000000
2005-01-01	5.5721700000000000
2006-01-01	5.1609000000000000
2007-01-01	5.3604100000000000
2008-01-01	5.4265700000000000
2009-01-01	5.3654100000000000
2010-01-01	6.6712100000000000
2011-01-01	5.9311300000000005
2012-01-01	6.9505899999999990
2013-01-01	6.5430699999999990
2014-01-01	2.3927600000000000
2015-01-01	2.2981000000000000
2016-01-01	1.1409900000000000
2017-01-01	1.1240400000000000