Year	Percent
1960-01-01	4.8690200000000000
1961-01-01	5.4446400000000000
1962-01-01	6.9716100000000010
1963-01-01	7.1325800000000000
1964-01-01	6.2329200000000000
1965-01-01	8.6257200000000000
1966-01-01	8.9676000000000000
1967-01-01	8.8974700000000000
1968-01-01	8.1362200000000000
1969-01-01	8.8182800000000000
1970-01-01	10.1875000000000000
1971-01-01	8.8518500000000000
1972-01-01	8.1084600000000010
1973-01-01	5.8709200000000000
1974-01-01	2.5729200000000000
1975-01-01	2.8481000000000000
1976-01-01	1.9918300000000000
1977-01-01	1.9918300000000000
1978-01-01	1.9918300000000000
1979-01-01	1.9918300000000000
1980-01-01	1.9918300000000000
1981-01-01	1.9918300000000000
1982-01-01	1.9918300000000000
1983-01-01	1.9918300000000000
1984-01-01	1.9918300000000000
1985-01-01	1.9918300000000000
1986-01-01	1.9918300000000000
1987-01-01	1.9918300000000000
1988-01-01	1.9918300000000000
1989-01-01	1.9918300000000000
1990-01-01	1.9918300000000000
1991-01-01	1.9918300000000000
1992-01-01	1.9918300000000000
1993-01-01	1.9918300000000000
1994-01-01	1.9918300000000000
1995-01-01	1.9918300000000000
1996-01-01	1.9918300000000000
1997-01-01	1.9918300000000000
1998-01-01	1.9918300000000000
1999-01-01	1.9918300000000000
2000-01-01	1.9918300000000000
2001-01-01	1.9918300000000000
2002-01-01	1.9918300000000000
2003-01-01	1.9918300000000000
2004-01-01	1.9918300000000000
2005-01-01	1.9918300000000000
2006-01-01	6.7847600000000000
2007-01-01	5.5068699999999990
2008-01-01	3.2240400000000000
2009-01-01	3.0593800000000000
2010-01-01	2.5960000000000000
2011-01-01	1.8817000000000000
2012-01-01	1.3547500000000000
2013-01-01	1.0819800000000000
2014-01-01	0.9576360000000000
2015-01-01	2.6564200000000002
2016-01-01	7.1520500000000000