| Year | Month | Dividend (%) |
|---|---|---|
| 2025 | May | 25 |
| 2024 | May | 20 |
| 2023 | May | 20 |
| 2022 | May | 20 |
| 2021 | May | 15 |
| 2020 | Jun | 15 |
| 2019 | May | 15 |
| 2018 | May | 5 |
| 2015 | May | 15 |
| 2014 | May | 15 |
| 2013 | May | 30 |
| 2012 | Jun | 30 |
| 2011 | Apr | 30 |
| 2010 | Apr | 40 |
| 2009 | Apr | 40 |
| 2008 | Jun | 40 |
| 2007 | Jun | 10 |
| 2007 | Mar | 30 |
| 2006 | Jun | 38 |
| 2005 | Apr | 30 |
| 2004 | Jul | 30 |
| 2003 | May | 30 |
| 2002 | May | 28 |
| 2001 | May | 25 |
| 2000 | Jul | 22 |
| 1999 | Jul | 25 |
| 1998 | Jul | 35 |
| 1997 | Aug | 40 |