Year	Percent
1960-01-01	7.5460300000000000000
1961-01-01	6.9176199999999990000
1962-01-01	6.4911100000000000000
1963-01-01	6.1058400000000000000
1964-01-01	5.2627100000000000000
1965-01-01	5.5482300000000000000
1966-01-01	6.0870000000000010000
1967-01-01	5.9705300000000000000
1968-01-01	6.6340800000000000000
1969-01-01	7.3492500000000000000
1970-01-01	7.3580600000000010000
1971-01-01	6.3894000000000000000
1972-01-01	5.5037199999999995000
1973-01-01	5.1383500000000000000
1974-01-01	5.2600300000000000000
1975-01-01	6.0186600000000000000
1976-01-01	7.8974199999999990000
1977-01-01	8.7747900000000000000
1978-01-01	7.6017700000000000000
1979-01-01	8.1508399999999990000
1980-01-01	10.6531000000000000000
1981-01-01	13.4713000000000000000
1982-01-01	15.7709000000000000000
1983-01-01	17.2110000000000000000
1984-01-01	16.9961000000000000000
1985-01-01	9.2529300000000010000
1986-01-01	2.9627500000000000000
1987-01-01	2.2835000000000000000
1988-01-01	0.8780170000000000000
1989-01-01	0.9765219999999999000
1990-01-01	1.2303899999999999000
1991-01-01	1.6366700000000000000
1992-01-01	1.3940600000000000000
1993-01-01	0.9949940000000000000
1994-01-01	1.6678300000000000000
1995-01-01	1.9081200000000000000
1996-01-01	1.7529599999999999000
1997-01-01	1.7616500000000000000
1998-01-01	1.5133400000000000000
1999-01-01	1.3922700000000001000
2000-01-01	1.2909000000000000000
2001-01-01	1.2890800000000000000
2002-01-01	1.3170300000000000000
2003-01-01	1.2685000000000000000
2004-01-01	1.1202299999999998000
2005-01-01	0.8485000000000000000
2006-01-01	0.6642540000000000000
2007-01-01	0.4781720000000000400
2008-01-01	0.2533770000000000000
2009-01-01	0.1943940000000000000
2010-01-01	0.1101430000000000000
2011-01-01	0.0519310000000000000
2012-01-01	0.0390970000000000000
2013-01-01	0.0327660000000000000
2014-01-01	0.0158199999999999970
2015-01-01	0.0070599999999999994
2016-01-01	0.0046110000000000000