Year	Percent
1962-01-01	0.0937500000000000
1963-01-01	0.0906430000000000
1964-01-01	0.1170930000000000
1965-01-01	0.0690070000000000
1966-01-01	0.0690070000000000
1967-01-01	0.0690070000000000
1968-01-01	0.0690070000000000
1969-01-01	0.0690070000000000
1970-01-01	0.0690070000000000
1971-01-01	0.0690070000000000
1972-01-01	0.0019300000000000
1973-01-01	0.0026460000000000
1974-01-01	0.0055470000000000
1975-01-01	1.0678800000000000
1976-01-01	2.0762400000000003
1977-01-01	2.9601599999999997
1978-01-01	4.7621500000000000
1979-01-01	6.0375900000000000
1980-01-01	5.9131199999999990
1981-01-01	7.6864000000000000
1982-01-01	9.5872800000000000
1983-01-01	10.7016000000000000
1984-01-01	12.4817000000000000
1985-01-01	12.2715000000000000
1986-01-01	11.5373000000000000
1987-01-01	11.5171000000000000
1988-01-01	9.5232700000000000
1989-01-01	8.7709000000000000
1990-01-01	8.6641000000000000
1991-01-01	8.2479200000000000
1992-01-01	8.0714000000000000
1993-01-01	9.9632600000000000
1994-01-01	8.1970700000000000
1995-01-01	8.4220300000000000
1996-01-01	8.7417800000000000
1997-01-01	7.4277899999999990
1998-01-01	8.4012100000000000
1999-01-01	7.7687500000000000
2000-01-01	7.3684800000000000
2001-01-01	7.2844500000000000
2002-01-01	6.1404600000000000
2003-01-01	5.3135200000000000
2004-01-01	4.0885400000000000
2005-01-01	3.1224900000000000
2006-01-01	2.3404599999999998
2007-01-01	1.7409700000000001
2008-01-01	1.8995300000000000
2009-01-01	4.1264100000000000
2010-01-01	6.2076900000000000
2011-01-01	6.4531700000000000
2012-01-01	5.8754300000000010
2013-01-01	5.2863200000000000
2014-01-01	4.5293100000000000
2015-01-01	3.6593800000000000
2016-01-01	2.7813300000000000