Year	Percent
1980-01-01	0.40860799999999997
1981-01-01	0.38609899999999997
1982-01-01	0.49896499999999994
1983-01-01	0.54664499999999990
1984-01-01	0.44246800000000003
1985-01-01	0.33971599999999996
1986-01-01	0.40135600000000000
1987-01-01	0.25305900000000003
1988-01-01	0.12489400000000000
1989-01-01	0.09883700000000000
1990-01-01	11.28560000000000000
1991-01-01	9.83804000000000000
1992-01-01	8.67871000000000000
1993-01-01	7.22913999999999900
1994-01-01	6.94873999999999900
1995-01-01	9.87011000000000000
1996-01-01	11.65520000000000000
1997-01-01	9.72956999999999900
1998-01-01	9.27575000000000000
1999-01-01	9.11506000000000000
2000-01-01	7.78871000000000100
2001-01-01	6.73846000000000100
2002-01-01	6.56546999999999950
2003-01-01	5.61208000000000100
2004-01-01	5.65020999999999950
2005-01-01	4.94215000000000000
2006-01-01	4.28947000000000000
2007-01-01	3.94847000000000000
2008-01-01	3.56970000000000000
2009-01-01	4.70990000000000000
2010-01-01	4.20182000000000000
2011-01-01	3.87795000000000000
2012-01-01	4.10514000000000050
2013-01-01	4.20555000000000000
2014-01-01	4.33554000000000000
2015-01-01	5.33741000000000000
2016-01-01	6.27980999999999940