| Year | Ratio | Ex Bonus Date |
| 2011 | 1:1 | Apr 18, 2011 |
| 1996 | 1:1 | Feb 19, 1996 |
| 1989 | 1:1 | Sep 15, 1989 |
| 1986 | 1:1 | |
| 1983 | 4:5 |
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