| Year | Month | Dividend (%) |
|---|---|---|
| 2019 | May | 25 |
| 2018 | Jun | 25 |
| 2017 | Jun | 25 |
| 2016 | May | 25 |
| 2015 | May | 25 |
| 2014 | May | 25 |
| 2013 | May | 50 |
| 2012 | Jun | 100 |
| 2011 | May | 100 |
| 2010 | May | 100 |
| 2009 | Jun | 100 |
| 2008 | Jun | 100 |
| 2007 | Jun | 80 |
| 2006 | Jun | 50 |
| 2005 | Jun | 45 |
| 2004 | Aug | 15 |
| 2003 | Jul | 15 |
| 2002 | Jul | 15 |
| 2001 | Jun | 15 |
| 2000 | Aug | 15 |
| 1999 | Sep | 20 |
| 1998 | Sep | 30 |
| 1997 | Sep | 30 |