Year	Percent
1973-01-01	5.66028000000000000
1974-01-01	5.39418000000000000
1975-01-01	6.71596000000000100
1976-01-01	6.39462000000000000
1977-01-01	6.09840999999999900
1978-01-01	5.81198000000000000
1979-01-01	5.59261000000000000
1980-01-01	5.52349000000000000
1981-01-01	6.08862000000000000
1982-01-01	5.94670999999999950
1983-01-01	6.15506000000000000
1984-01-01	6.87898999999999900
1985-01-01	7.69703000000000100
1986-01-01	8.66585000000000000
1987-01-01	9.66551000000000100
1988-01-01	10.52099999999999900
1989-01-01	9.82258000000000000
1990-01-01	9.66293999999999900
1991-01-01	9.16602000000000000
1992-01-01	9.66276000000000000
1993-01-01	8.69216999999999900
1994-01-01	6.89476999999999900
1995-01-01	6.73371000000000000
1996-01-01	6.72310000000000000
1997-01-01	3.89124000000000030
1998-01-01	1.29349000000000000
1999-01-01	1.35374000000000000
2000-01-01	1.60822999999999980
2001-01-01	1.81125000000000000
2002-01-01	1.94058000000000000
2003-01-01	2.16085000000000000
2004-01-01	2.08129000000000000
2005-01-01	1.92057000000000000
2006-01-01	1.92430000000000000
2007-01-01	1.13558000000000000
2008-01-01	0.36265500000000000
2009-01-01	0.42196700000000000
2010-01-01	0.44784500000000000
2011-01-01	0.37615700000000000
2012-01-01	0.34285800000000000
2013-01-01	0.33325100000000000
2014-01-01	0.35678000000000004
2015-01-01	0.42238600000000000