| Year | Ratio | Ex Bonus Date |
| 2015 | 1:1 | |
| 2015 | 1:1 | |
| 2015 | 1:1 | Sep 23, 2015 |
| 1993 | 1:1 | Dec 10, 1993 |
| 1991 | 3:5 | Nov 15, 1991 |
| 1989 | 1:1 | |
| 1987 | 1:1 |
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