Year	Percent
1980-01-01	4.6079000000000000
1981-01-01	3.9321599999999997
1982-01-01	4.8353600000000000
1983-01-01	5.1626900000000004
1984-01-01	5.4520400000000000
1985-01-01	5.2963100000000000
1986-01-01	6.7317000000000000
1987-01-01	4.5808900000000000
1988-01-01	5.8297700000000000
1989-01-01	5.9350000000000000
1990-01-01	5.9350000000000000
1991-01-01	14.2434000000000000
1992-01-01	23.6249000000000000
1993-01-01	51.3154000000000000
1994-01-01	46.6172000000000000
1995-01-01	17.4001000000000000
1996-01-01	5.2256400000000000
1997-01-01	2.3946000000000000
1998-01-01	0.5710000000000001
1999-01-01	0.5820000000000001
2000-01-01	0.5740000000000000
2001-01-01	0.6910000000000000
2002-01-01	0.8140000000000001
2003-01-01	0.7929999999999999
2004-01-01	0.8809999999999999
2005-01-01	0.7530000000000000
2006-01-01	0.7400000000000000
2007-01-01	0.5130000000000000
2008-01-01	60.6941000000000000
2009-01-01	0.6590000000000000
2010-01-01	74.4383000000000000
2011-01-01	74.2321000000000000
2012-01-01	0.4300000000000000
2013-01-01	0.6650000000000000