| Year | Month | Dividend (%) |
|---|---|---|
| 2023 | Jul | 40 |
| 2022 | Apr | 40 |
| 2020 | Oct | 40 |
| 2020 | Mar | 20 |
| 2019 | May | 30 |
| 2018 | May | 30 |
| 2017 | May | 30 |
| 2016 | May | 30 |
| 2015 | Apr | 30 |
| 2014 | Jun | 20 |
| 2013 | May | 40 |
| 2012 | May | 40 |
| 2011 | May | 40 |
| 2010 | May | 35 |
| 2009 | Jun | 30 |
| 2008 | Jun | 30 |
| 2007 | Jun | 30 |
| 2006 | May | 25 |
| 2005 | Jun | 20 |
| 2004 | May | 20 |
| 2003 | May | 10 |
| 1998 | Jul | 10 |
| 1997 | Aug | 15 |