| Year | Month | Dividend (%) |
|---|---|---|
| 2025 | May | 20 |
| 2024 | May | 18 |
| 2023 | May | 15 |
| 2022 | May | 12 |
| 2021 | Jun | 10 |
| 2020 | Jul | 8 |
| 2019 | May | 11 |
| 2018 | May | 11 |
| 2017 | May | 13 |
| 2016 | May | 10 |
| 2014 | May | 5 |
| 2013 | May | 8 |
| 2012 | Apr | 15 |
| 2011 | May | 10 |
| 2008 | May | 8 |
| 2007 | May | 6 |
| 2006 | May | 5 |
| 2005 | Apr | 5 |
| 2004 | May | 4 |
| 2001 | May | 4 |
| 1999 | Apr | - |