| Year | Ratio | Ex Right Date |
| 2002 | 2:5 | Dec 02, 2003 |
| 1999 | 1:1 | May 15, 2000 |
| 1993 | 1:1 | Dec 13, 1993 |
| 1991 | 10:100 | Dec 21, 1991 |
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