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| 1975 | 1976 | 1977 | 1978 | 1979 |
|---|---|---|---|---|
| January | January | |||
| March | March | March | March | |
| May | May | May | ||
| July | July | July | ||
| August | ||||
| September | September | September | September | |
| October | October | |||
| November | ||||
| December | December | December |
