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| 1968a | 1969a | 1969b | 1969c | 1971 |
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| 1976a | 1976b | 1976c | 1976d | 1976e |
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| 1976f | 1978a | 1978b | 1979 | 1980 |
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| 1981a | 1981b | 1982a | 1982b | 1982c |
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| 1983a | 1983b | 1984 | 1985* | 1987 |
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| 1988a | 1988b | 1990a | 1990b | 1990c |
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| 1991a | 1991b | 1991c | ||