| Year | Ratio | Ex Right Date |
| 2017 | 1:6 | Oct 12, 2017 |
| 2010 | 2:5 | Feb 17, 2011 |
| 2006 | 1:2 | Dec 13, 2006 |
| 2002 | 1:1 | Oct 21, 2002 |
| 1995 | 1:1 | Feb 13, 1995 |
| 1991 | 1:3 | Oct 03, 1991 |
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