Year	Percent
1960-01-01	0.1607350000000000
1961-01-01	1.1212400000000000
1962-01-01	3.1544600000000000
1963-01-01	6.2862700000000000
1964-01-01	8.0785500000000000
1965-01-01	9.6423000000000000
1966-01-01	12.2766000000000000
1967-01-01	17.2694000000000000
1968-01-01	19.0178000000000000
1969-01-01	16.5562000000000000
1970-01-01	9.9357300000000000
1971-01-01	11.0616000000000000
1972-01-01	10.8448000000000000
1973-01-01	8.0693600000000010
1974-01-01	7.5930100000000005
1975-01-01	10.2021000000000000
1976-01-01	12.4471000000000000
1977-01-01	14.4548000000000000
1978-01-01	10.9662000000000000
1979-01-01	11.7141000000000000
1980-01-01	9.5945200000000000
1981-01-01	9.0767700000000000
1982-01-01	8.8246800000000000
1983-01-01	8.2582000000000000
1984-01-01	8.0358300000000000
1985-01-01	9.3210300000000000
1986-01-01	9.5417399999999990
1987-01-01	11.9875000000000000
1988-01-01	11.6253000000000000
1989-01-01	9.1180500000000000
1990-01-01	7.7846899999999990
1991-01-01	7.7209100000000010
1992-01-01	8.9221600000000000
1993-01-01	11.2656000000000000
1994-01-01	11.5385000000000000
1995-01-01	10.7579000000000000
1996-01-01	9.1442199999999990
1997-01-01	8.5636600000000000
1998-01-01	23.4426000000000000
1999-01-01	40.3579000000000000
2000-01-01	44.7889999999999940
2001-01-01	24.4599000000000000
2002-01-01	20.2723000000000000
2003-01-01	20.7531000000000000
2004-01-01	7.9202000000000000
2005-01-01	8.3578000000000000
2006-01-01	7.6158500000000000
2007-01-01	8.4595000000000000
2008-01-01	9.8440400000000000
2009-01-01	8.9549000000000000
2010-01-01	6.5750100000000010
2011-01-01	6.1262400000000000
2012-01-01	6.8152700000000000
2013-01-01	8.7173400000000000
2014-01-01	11.9144000000000000
2015-01-01	11.6382000000000000
2016-01-01	9.5633500000000000