Year	Percent
1960-01-01	14.200000000000000
1961-01-01	16.950000000000000
1962-01-01	20.750000000000000
1963-01-01	11.725000000000000
1964-01-01	9.816670000000000
1965-01-01	9.600000000000000
1966-01-01	10.150000000000000
1967-01-01	11.266700000000000
1968-01-01	13.507100000000000
1969-01-01	15.950000000000000
1970-01-01	12.137200000000000
1971-01-01	11.796800000000000
1972-01-01	11.594300000000000
1973-01-01	11.188500000000000
1974-01-01	13.482000000000001
1975-01-01	9.670060000000001
1976-01-01	7.135550000000000
1977-01-01	9.272710000000000
1978-01-01	10.843200000000000
1979-01-01	12.762700000000000
1980-01-01	14.833800000000000
1981-01-01	18.849300000000000
1982-01-01	19.131800000000000
1983-01-01	15.132500000000000
1984-01-01	12.789600000000000
1985-01-01	9.462539999999999
1986-01-01	11.769900000000000
1987-01-01	12.912300000000000
1988-01-01	11.267700000000000
1989-01-01	18.502200000000000
1990-01-01	8.018610000000000
1991-01-01	8.478850000000000
1992-01-01	11.624200000000000
1993-01-01	15.049600000000000
1994-01-01	16.831800000000000
1995-01-01	18.236200000000000
1996-01-01	17.767700000000000
1997-01-01	18.457600000000000
1998-01-01	20.610600000000000
1999-01-01	22.581800000000000
2000-01-01	21.763000000000000
2001-01-01	20.566600000000000
2002-01-01	15.005300000000000
2003-01-01	10.698200000000000
2004-01-01	8.865750000000000
2005-01-01	9.164620000000000
2006-01-01	10.004400000000000
2007-01-01	10.908300000000000
2008-01-01	10.831500000000000
2009-01-01	11.445500000000000
2010-01-01	10.656800000000000
2011-01-01	11.460999999999999
2012-01-01	12.937100000000000
2013-01-01	13.379400000000000
2014-01-01	12.285600000000000
2015-01-01	12.428500000000000
2016-01-01	11.966500000000000