Year	Percent
1960-01-01	2.0288400000000000
1961-01-01	1.9927900000000000
1962-01-01	1.6774799999999999
1963-01-01	1.4245200000000000
1964-01-01	1.8044600000000000
1965-01-01	1.9741600000000000
1966-01-01	2.4245900000000002
1967-01-01	2.7748100000000000
1968-01-01	1.7169299999999998
1969-01-01	0.6097170000000000
1970-01-01	0.8664639999999999
1971-01-01	1.4456799999999999
1972-01-01	1.4742100000000000
1973-01-01	1.9108000000000000
1974-01-01	2.6620700000000000
1975-01-01	3.9585600000000000
1976-01-01	5.5914600000000000
1977-01-01	6.3562000000000000
1978-01-01	8.0582000000000000
1979-01-01	10.3949000000000000
1980-01-01	14.5723000000000000
1981-01-01	17.3305000000000000
1982-01-01	19.9805000000000000
1983-01-01	19.4670000000000000
1984-01-01	15.9387000000000000
1985-01-01	16.5908000000000000
1986-01-01	11.5974000000000000
1987-01-01	9.3292300000000000
1988-01-01	8.2357800000000000
1989-01-01	6.8432500000000000
1990-01-01	14.1016000000000000
1991-01-01	10.0242000000000000
1992-01-01	6.6076399999999990
1993-01-01	4.3643400000000000
1994-01-01	31.2832000000000000
1995-01-01	45.4488000000000000
1996-01-01	32.6422000000000000
1997-01-01	36.5628000000000000
1998-01-01	30.9848000000000000
1999-01-01	28.4473000000000000
2000-01-01	29.8795000000000000
2001-01-01	29.7013000000000000
2002-01-01	24.9631000000000000
2003-01-01	20.7221000000000000
2004-01-01	16.8093000000000000
2005-01-01	12.5183000000000000
2006-01-01	10.8570000000000010
2007-01-01	6.2700200000000000
2008-01-01	2.4241900000000003
2009-01-01	3.0382400000000000
2010-01-01	4.3739300000000005
2011-01-01	3.7546800000000005
2012-01-01	1.7045599999999999
2013-01-01	1.7343099999999998
2014-01-01	3.5072900000000002
2015-01-01	5.0704000000000000
2016-01-01	6.2005500000000000