Year	Rate
1934	0.28
1935	0.17
1936	0.17
1937	0.28
1938	0.07
1939	0.05
1940	0.04
1941	0.13
1942	0.34
1943	0.38
1944	0.38
1945	0.38
1946	0.38
1947	0.6
1948	1.05
1949	1.12
1950	1.2
1951	1.52
1952	1.72
1953	1.89
1954	0.94
1955	1.73
1956	2.63
1957	3.23
1958	1.77
1959	3.39
1960	2.88
1961	2.35
1962	2.77
1963	3.16
1964	3.55
1965	3.95
1966	4.86
1967	4.31
1968	5.34
1969	6.67
1970	6.39
1971	4.33
1972	4.07
1973	7.03
1974	7.83
1975	5.78
1976	4.97
1977	5.27
1978	7.19
1979	10.07
1980	11.43
1981	14.03
1982	10.61
1983	8.61
1984	9.52
1985	7.48
1986	5.98
1987	5.78
1988	6.67
1989	8.11
1990	7.49
1991	5.38
1992	3.43
1993	3
1994	4.25
1995	5.49
1996	5.01
1997	5.06
1998	4.78
1999	4.64
2000	5.82
2001	3.39
2002	1.6
2003	1.01
2004	1.37
2005	3.15
2006	4.73
2007	4.35
2008	1.37
2009	0.15
2010	0.14
2011	0.05
2012	0.09
2013	0.06
2014	0.03
2015	0.05
2016	0.38