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1918 0.7582 1919 1.062 1920 1.5233 1921 2.001 1922 2.3595 1923 2.5266 1924 2.5601 1925 2.4989 1926 2.0897 1927 1.6231 1928 1.075 1929 0.9933 1930 1.4687 1931 1.6581 1932 1.6342 1933 1.7651 1934 1.9639 1935 1.7972 1936 1.7876 1937 2.1393 1938 2.0442 1939 1.6957 1940 1.5676 1941 1.7842 1942 1.7588 1943 1.6431 1944 1.6047 1945 1.5482 1946 1.5025 1947 1.7361 1948 1.8666 1949 1.7336 1950 1.5008 1951 1.2193 1952 1.3099 1953 1.7064 1954 1.7984 1955 1.4952 1956 1.3118 1957 1.2956 1958 1.2341 1959 1.4246 1960 1.4169 1961 0.8479 1962 0.3633 1963 0.3067 1964 0.6043 1965 0.4944 1966 0.4359 1967 0.4583 1968 0.4065 1969 0.3589 1970 0.4418 1971 0.5529 1972 0.8795 1973 1.1904 1974 1.2082 1975 1.429 1976 1.6616 1977 1.5056 1978 1.4163 1979 1.5964 1980 1.4309 1981 1.131 1982 1.118 1983 1.163 1984 1.1212 1985 1.104 1986 0.9611 1987 0.9155 1988 1.184 1989 1.4846 1990 1.5448 1991 1.5442 1992 1.7541 1993 2.1211 1994 2.0617 1995 1.5833 1996 1.326 1997 1.4289 1998 NA 1999 NA 2000 NA