Year	Percent
1960-01-01	8.6131300000000000
1961-01-01	8.6142600000000000
1962-01-01	8.7314200000000000
1963-01-01	9.2325600000000010
1964-01-01	7.8539300000000000
1965-01-01	10.5637000000000000
1966-01-01	13.1096000000000000
1967-01-01	13.2252000000000000
1968-01-01	11.8294000000000000
1969-01-01	12.1616000000000000
1970-01-01	12.3566000000000000
1971-01-01	11.3888000000000000
1972-01-01	11.6851000000000000
1973-01-01	10.6697000000000000
1974-01-01	6.0460400000000005
1975-01-01	6.2129800000000000
1976-01-01	5.7424300000000010
1977-01-01	5.7424300000000010
1978-01-01	5.7424300000000010
1979-01-01	5.7424300000000010
1980-01-01	5.7424300000000010
1981-01-01	5.7424300000000010
1982-01-01	5.7424300000000010
1983-01-01	5.7424300000000010
1984-01-01	5.7424300000000010
1985-01-01	5.7424300000000010
1986-01-01	5.7424300000000010
1987-01-01	5.7424300000000010
1988-01-01	5.7424300000000010
1989-01-01	5.7424300000000010
1990-01-01	5.7424300000000010
1991-01-01	5.7424300000000010
1992-01-01	5.7424300000000010
1993-01-01	5.7424300000000010
1994-01-01	5.7424300000000010
1995-01-01	5.7424300000000010
1996-01-01	5.7424300000000010
1997-01-01	5.7424300000000010
1998-01-01	5.7424300000000010
1999-01-01	5.7424300000000010
2000-01-01	5.7424300000000010
2001-01-01	5.7424300000000010
2002-01-01	5.7424300000000010
2003-01-01	5.7424300000000010
2004-01-01	5.7424300000000010
2005-01-01	5.7424300000000010
2006-01-01	2.2590400000000000
2007-01-01	2.1723500000000000
2008-01-01	2.2281700000000000
2009-01-01	3.5120900000000000
2010-01-01	4.1767800000000000
2011-01-01	4.7045300000000000
2012-01-01	5.3232599999999990
2013-01-01	5.9077500000000000
2014-01-01	6.4723400000000000
2015-01-01	8.8464100000000000
2016-01-01	9.5967700000000000