| Year | Ratio | Ex Bonus Date |
| 2017 | 1:1 | Dec 21, 2017 |
| 2012 | 1:1 | Sep 04, 2012 |
| 2010 | 1:1 | Apr 09, 2010 |
| 1999 | 1:1 | May 17, 1999 |
| 1995 | 3:5 | May 05, 1995 |
| 1994 | 1:1 | Feb 18, 1994 |
| 1992 | 3:5 | May 22, 1992 |
| 1990 | 3:5 | Nov 21, 1990 |
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