Year	Percent
1962-01-01	5.4755400000000005
1963-01-01	6.5370400000000000
1964-01-01	8.9875600000000000
1965-01-01	14.0985000000000000
1966-01-01	21.1364000000000000
1967-01-01	30.1250000000000000
1968-01-01	28.2772000000000000
1969-01-01	26.5265000000000000
1970-01-01	14.2831000000000000
1971-01-01	13.1180000000000000
1972-01-01	13.9101000000000000
1973-01-01	11.0053000000000000
1974-01-01	11.3076000000000000
1975-01-01	12.3396000000000000
1976-01-01	12.8162000000000000
1977-01-01	12.7229999999999990
1978-01-01	14.2171000000000000
1979-01-01	12.8772000000000000
1980-01-01	12.7171000000000000
1981-01-01	12.8834000000000000
1982-01-01	14.4307000000000000
1983-01-01	15.8550000000000000
1984-01-01	11.3323000000000000
1985-01-01	7.6828400000000000
1986-01-01	7.2931100000000000
1987-01-01	6.6345000000000000
1988-01-01	7.3639399999999995
1989-01-01	6.2148300000000000
1990-01-01	4.3022800000000005
1991-01-01	3.7576400000000003
1992-01-01	4.0089700000000000
1993-01-01	4.1656400000000000
1994-01-01	3.8322000000000000
1995-01-01	3.8327100000000000
1996-01-01	4.2507000000000000
1997-01-01	4.8121300000000010
1998-01-01	5.4061600000000000
1999-01-01	5.2133699999999990
2000-01-01	5.2543600000000000
2001-01-01	4.8510200000000000
2002-01-01	4.8840500000000000
2003-01-01	4.4614100000000000
2004-01-01	3.7926100000000000
2005-01-01	2.9798100000000000
2006-01-01	1.5976500000000000
2007-01-01	0.6089340000000000
2008-01-01	0.6608430000000001
2009-01-01	1.2107600000000000
2010-01-01	1.5626700000000000
2011-01-01	1.5229100000000000
2012-01-01	1.6697099999999998
2013-01-01	1.6765700000000001
2014-01-01	1.5966600000000000
2015-01-01	1.4113799999999999
2016-01-01	1.3708799999999999