| Year | Ratio | Ex Bonus Date |
| 2022 | 1:1 | Sep 23, 2022 |
| 2015 | 1:1 | Oct 21, 2015 |
| 1992 | 5:2 | Nov 20, 1992 |
| 1991 | 1:2 | Apr 19, 1991 |
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