Year	Percent
1963-01-01	0.56079200000000000
1964-01-01	0.47931599999999996
1965-01-01	0.47347700000000004
1966-01-01	0.57163800000000000
1967-01-01	0.71184200000000000
1968-01-01	1.00321000000000000
1969-01-01	1.37434000000000000
1970-01-01	1.35807000000000000
1971-01-01	1.56351000000000000
1972-01-01	1.73387999999999990
1973-01-01	2.26059000000000000
1974-01-01	3.07270000000000000
1975-01-01	3.82266999999999960
1976-01-01	4.92178000000000000
1977-01-01	5.84864000000000050
1978-01-01	6.65537000000000000
1979-01-01	7.19393000000000000
1980-01-01	7.04007000000000000
1981-01-01	7.04078999999999900
1982-01-01	7.61778000000000100
1983-01-01	7.61778000000000100
1984-01-01	7.61778000000000100
1985-01-01	7.61778000000000100
1986-01-01	7.61778000000000100
1987-01-01	7.61778000000000100
1988-01-01	7.61778000000000100
1989-01-01	7.61778000000000100
1990-01-01	7.61778000000000100
1991-01-01	7.61778000000000100
1992-01-01	10.86330000000000000
1993-01-01	11.22750000000000000
1994-01-01	11.87060000000000000
1995-01-01	12.31620000000000000
1996-01-01	12.22610000000000000
1997-01-01	12.33910000000000000
1998-01-01	12.63900000000000100
1999-01-01	12.48050000000000000
2000-01-01	9.24691000000000000
2001-01-01	6.24574000000000050
2002-01-01	6.43321000000000000
2003-01-01	5.82271999999999950
2004-01-01	4.35837000000000000
2005-01-01	3.02619000000000000
2006-01-01	2.52033000000000000
2007-01-01	2.47715000000000000
2008-01-01	2.48662000000000030
2009-01-01	2.65834000000000000
2010-01-01	3.04094000000000000
2011-01-01	3.47489000000000030
2012-01-01	3.58721000000000000
2013-01-01	3.69054000000000000
2014-01-01	3.73012000000000000
2015-01-01	3.96021000000000000
2016-01-01	3.99026999999999980