| Year | Month | Dividend (%) |
|---|---|---|
| 2023 | May | 10 |
| 2022 | Jul | 20 |
| 2021 | Jun | 15 |
| 2019 | May | 10 |
| 2012 | May | 10 |
| 2011 | May | 30 |
| 2010 | Jun | 30 |
| 2009 | May | 10 |
| 2008 | May | 25 |
| 2007 | May | 28 |
| 2006 | May | 35 |
| 2005 | Jun | 30 |
| 2004 | May | 30 |
| 2003 | May | 20 |
| 2002 | May | 15 |
| 2001 | May | 25 |
| 2000 | Apr | 15 |
| 1999 | Aug | 15 |
| 1998 | Jul | 20 |