Year	Percent
1960-01-01	2.88365000000000000
1961-01-01	2.21457000000000000
1962-01-01	1.54757000000000010
1963-01-01	1.37295000000000000
1964-01-01	1.66218000000000000
1965-01-01	1.46884000000000000
1966-01-01	1.24140000000000000
1967-01-01	0.42614900000000000
1968-01-01	0.42614900000000000
1969-01-01	0.42614900000000000
1970-01-01	0.04775600000000000
1971-01-01	0.04775600000000000
1972-01-01	0.04775600000000000
1973-01-01	0.04775600000000000
1974-01-01	1.56664000000000000
1975-01-01	3.68574000000000000
1976-01-01	2.52445000000000000
1977-01-01	1.53387000000000000
1978-01-01	2.06665999999999970
1979-01-01	4.56935000000000000
1980-01-01	7.60483000000000100
1981-01-01	8.89126000000000000
1982-01-01	7.33186999999999900
1983-01-01	6.58806000000000050
1984-01-01	6.28671000000000000
1985-01-01	7.05296999999999900
1986-01-01	6.47365000000000000
1987-01-01	5.72889000000000000
1988-01-01	7.09331999999999900
1989-01-01	5.74465000000000000
1990-01-01	5.39603000000000050
1991-01-01	7.85872000000000000
1992-01-01	10.44130000000000000
1993-01-01	12.49010000000000000
1994-01-01	10.99220000000000000
1995-01-01	11.01530000000000000
1996-01-01	12.54870000000000000
1997-01-01	11.50670000000000000
1998-01-01	10.85900000000000200
1999-01-01	9.86358000000000000
2000-01-01	10.47760000000000000
2001-01-01	10.86350000000000000
2002-01-01	7.29566000000000100
2003-01-01	7.98760000000000000
2004-01-01	7.39737000000000000
2005-01-01	9.51763000000000000
2006-01-01	11.10140000000000000
2007-01-01	9.82417000000000000
2008-01-01	4.64524000000000000
2009-01-01	0.11652100000000000
2010-01-01	0.11844300000000000
2011-01-01	0.11906600000000000
2012-01-01	0.12031700000000001
2013-01-01	0.12395899999999999
2014-01-01	0.11994000000000000
2015-01-01	0.11528300000000000
2016-01-01	0.10849400000000001