| Year | Ratio | Ex Bonus Date |
| 2003 | 1:1 | Jul 03, 2003 |
| 1987 | 3:5 | |
| 1983 | 3:5 | |
| 1980 | 1:4 | |
| 1977 | 3:8 | |
| 1974 | 8:9 | |
| 1968 | 1:5 | |
| 1965 | 1:5 |
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