Year	Percent
1980-01-01	13.6233000000000000
1981-01-01	12.7034000000000000
1982-01-01	13.7823000000000000
1983-01-01	14.4868000000000000
1984-01-01	16.5483000000000000
1985-01-01	16.3571000000000000
1986-01-01	15.4559000000000000
1987-01-01	15.3601000000000000
1988-01-01	13.0568000000000000
1989-01-01	10.6044000000000000
1990-01-01	9.6949800000000010
1991-01-01	9.3867900000000000
1992-01-01	10.3381000000000000
1993-01-01	9.3854200000000000
1994-01-01	9.7785600000000000
1995-01-01	11.0852000000000000
1996-01-01	8.7563200000000000
1997-01-01	7.8875399999999996
1998-01-01	7.5600200000000000
1999-01-01	6.8490000000000000
2000-01-01	5.0700000000000000
2001-01-01	4.3974600000000000
2002-01-01	3.6902000000000000
2003-01-01	3.6267699999999996
2004-01-01	3.0427200000000000
2005-01-01	2.7070000000000000
2006-01-01	2.2557300000000000
2007-01-01	0.8544550000000000
2008-01-01	1.8353599999999999
2009-01-01	5.6021000000000000
2010-01-01	25.9065000000000000
2011-01-01	24.8437000000000000
2012-01-01	27.0869000000000000
2013-01-01	11.4588000000000000
2014-01-01	10.6900000000000000
2015-01-01	7.3852000000000000
2016-01-01	6.6502899999999990