| Year | Ratio | Ex Right Date |
| 2010 | 4:9 | Jul 08, 2010 |
| 2006 | 1:5 | May 08, 2007 |
| 2005 | 1:10 | Apr 29, 2005 |
| 1992 | 1:3 | May 22, 1992 |
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