Year | Value | 1996 | 0.019999999999996 | 1995 | 0.090000000000003 | 1994 | 0.109 | 1993 | 0.133 | 1992 | 0.161 | 1991 | 0.19499999999999 | 1990 | 0.23699999999999 | 1989 | 0.288 | 1988 | 0.349 | 1987 | 0.42400000000001 | 1986 | 0.514 | 1985 | 0.623 | 1984 | 0.756 | 1983 | 0.916 | 1982 | 1.111 | 1981 | 1.345 | 1980 | 1.481 | 1979 | 1.59 | 1978 | 1.706 | 1977 | 1.831 | 1976 | 1.965 | 1975 | 2.109 | 1974 | 2.262 | 1973 | 2.427 | 1972 | 2.603 | 1971 | 2.792 | 1970 | 2.968 | 1969 | 3.123 | 1968 | 3.285 | 1967 | 3.456 | 1966 | 3.635 | 1965 | 3.823 | 1964 | 4.02 | 1963 | 4.227 | 1962 | 4.444 | 1961 | 4.672 | 1960 | 4.711 |
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