| Year | Month | Dividend (%) |
|---|---|---|
| 2018 | May | 10 |
| 2017 | May | 25 |
| 2016 | May | 70 |
| 2015 | May | 70 |
| 2014 | May | 70 |
| 2013 | May | 70 |
| 2012 | May | 65 |
| 2011 | Apr | 65 |
| 2010 | Apr | 60 |
| 2009 | May | 55 |
| 2008 | Apr | 50 |
| 2007 | May | 48 |
| 2006 | Apr | 44 |
| 2005 | May | 40 |
| 2004 | May | 30 |
| 2003 | May | 20 |
| 2002 | May | 15 |
| 2001 | Jun | 15 |
| 2000 | May | 15 |
| 1999 | Jul | 15 |
| 1998 | Jul | 15 |