1933	0.44
1934	1.18
1935	2.69
1936	2.08
1937	3.66
1938	1.72
1939	2.82
1940	0.72
1941	1.46
1942	1.3
1943	1.35
1944	0.54
1957	1.36
1945	2.74
1946	1.13
1947	2.5
1948	1.72
1949	2.27
1950	2.82
1951	1.98
1952	2.44
1953	2.53
1954	2
1955	1.12
1956	2.13
1982	1.51
1958	4.9
1959	2.94
1960	1.75
1961	1.69
1962	1.88
1963	1.31
1964	1.76
1965	2.17
1966	2.38
1967	1.16
1968	1.39
1969	1.36
1970	1.03
1971	1.11
1972	1.35
1973	1.44
1974	1.84
1975	1.69
1976	3
1977	1.36
1978	6.37
1979	4.55
1980	0.52
1981	0.87