| Year | Ratio | Ex Bonus Date |
| 2022 | 1:2 | Jun 30, 2022 |
| 2018 | 1:1 | Mar 15, 2018 |
| 2016 | 1:1 | Oct 18, 2016 |
| 2009 | 1:1 | Oct 29, 2009 |
| 2003 | 1:2 | Aug 14, 2003 |
| 1999 | 1:1 | Sep 20, 1999 |
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