| Year | Ratio | Ex Bonus Date |
| 2024 | 1:1 | Dec 03, 2024 |
| 2019 | 1:3 | Mar 06, 2019 |
| 2017 | 1:1 | Jun 13, 2017 |
| 2010 | 2:3 | Jun 15, 2010 |
| 2005 | 1:1 | Aug 22, 2005 |
| 2004 | 2:1 | Jun 25, 2004 |
| 1997 | 2:1 | Oct 20, 1997 |
| 1995 | 1:1 | Feb 24, 1995 |
| 1992 | 1:1 | Aug 12, 1992 |
| 1989 | 1:1 | |
| 1987 | 1:1 | |
| 1985 | 1:1 | |
| 1981 | 1:1 | |
| 1971 | 1:3 |
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