Year | Value | 1989 | 1.5299921355544 | 1988 | 17.435716801691 | 1987 | 16.956211327939 | 1986 | 28.948241539482 | 1985 | 0.050709706959707 | 1984 | 0.14312762748307 | 1983 | 0.23932452862481 | 1982 | 0.28826662085552 | 1981 | 0.60770975056689 | 1980 | 0.54973520607875 | 1979 | 0.97466103578573 | 1978 | 0.99498838772766 | 1977 | 0.46075581395349 | 1976 | 0.51751279024006 | 1975 | 0.51620111731844 | 1974 | 0.72714916751614 | 1973 | 0.50549450549451 | 1972 | 0.45360824742268 | 1971 | 0.48305084745763 | 1970 | 0.49601417183348 | 1969 | 0.41958041958042 | 1968 | 0.4072265625 | 1967 | 0.38794435857805 | 1966 | 0.35364526659412 | 1965 | 0.29695577254451 | 1964 | 0.33048780487805 | 1963 | 0.29015544041451 | 1962 | 0.2544704264099 | 1961 | 0.23082542001461 |
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