Year	Percent
1980-01-01	1.2060300000000000
1981-01-01	1.1040700000000000
1982-01-01	3.0387800000000000
1983-01-01	6.2875600000000000
1984-01-01	8.4837200000000000
1985-01-01	15.6308000000000000
1986-01-01	18.9692000000000000
1987-01-01	18.8161000000000000
1988-01-01	16.2684000000000000
1989-01-01	14.4365000000000000
1990-01-01	13.3540000000000010
1991-01-01	12.2315000000000000
1992-01-01	8.1028000000000000
1993-01-01	5.3559500000000000
1994-01-01	3.0241900000000000
1995-01-01	2.1147800000000000
1996-01-01	1.5929000000000000
1997-01-01	1.3752400000000000
1998-01-01	1.2344600000000001
1999-01-01	2.2876600000000000
2000-01-01	2.8179700000000000
2001-01-01	3.8168500000000000
2002-01-01	4.3157200000000000
2003-01-01	3.5521000000000000
2004-01-01	3.1516599999999997
2005-01-01	2.2431900000000002
2006-01-01	1.9997200000000002
2007-01-01	1.6764299999999999
2008-01-01	1.4032400000000000
2009-01-01	0.8309790000000001
2010-01-01	1.1626299999999998
2011-01-01	1.3461299999999998
2012-01-01	1.2807700000000000
2013-01-01	1.3765100000000001
2014-01-01	1.3165900000000000
2015-01-01	1.5659600000000000
2016-01-01	1.6661200000000000