Year	Percent
1960-01-01	3.70000000000000000
1961-01-01	3.75000000000000000
1962-01-01	3.80000000000000000
1963-01-01	1.97500000000000000
1964-01-01	1.41667000000000000
1965-01-01	1.26250000000000000
1966-01-01	1.37000000000000000
1967-01-01	1.57500000000000000
1968-01-01	1.91429000000000000
1969-01-01	2.99375000000000000
1970-01-01	3.17667999999999970
1971-01-01	1.53705000000000000
1972-01-01	0.61836000000000000
1973-01-01	0.74589900000000000
1974-01-01	0.91762199999999990
1975-01-01	0.67573900000000000
1976-01-01	0.93627500000000000
1977-01-01	1.81408000000000000
1978-01-01	2.18412000000000000
1979-01-01	2.18467000000000000
1980-01-01	2.48291000000000000
1981-01-01	2.70995000000000000
1982-01-01	1.88585000000000000
1983-01-01	1.00190000000000000
1984-01-01	0.56046900000000000
1985-01-01	0.27575700000000003
1986-01-01	0.29462000000000000
1987-01-01	0.26050400000000000
1988-01-01	0.18566400000000002
1989-01-01	0.20438900000000002
1990-01-01	0.06091799999999999
1991-01-01	0.08516599999999999
1992-01-01	0.14694600000000000
1993-01-01	0.22136399999999998
1994-01-01	0.27668000000000004
1995-01-01	0.29245200000000000
1996-01-01	0.28703600000000000
1997-01-01	0.33558200000000000
1998-01-01	0.46195800000000000
1999-01-01	0.65509700000000000
2000-01-01	0.70656000000000010
2001-01-01	0.67896400000000000
2002-01-01	0.51212100000000000
2003-01-01	0.34754800000000000
2004-01-01	0.26937800000000000
2005-01-01	0.25365800000000000
2006-01-01	0.30913300000000000
2007-01-01	0.41111200000000000
2008-01-01	0.44760600000000006
2009-01-01	0.44536800000000004
2010-01-01	0.36608500000000000
2011-01-01	0.39864200000000000
2012-01-01	0.46976999999999997
2013-01-01	0.48603199999999996
2014-01-01	0.38694700000000000
2015-01-01	0.31721700000000000
2016-01-01	0.35070000000000000