| Year | Ratio | Ex Bonus Date |
| 1990 | 1:1 | |
| 1987 | 1:1 | Jan 05, 1987 |
| 1980 | 1:1 | |
| 1976 | 1:5 | |
| 1974 | 1:5 | |
| 1967 | 1:5 |
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