| Year | Month | Dividend (%) |
|---|---|---|
| 2018 | May | 5 |
| 2017 | Aug | 10 |
| 2016 | May | 10 |
| 2015 | May | 10 |
| 2014 | May | 10 |
| 2013 | May | 10 |
| 2012 | May | 20 |
| 2011 | May | 25 |
| 2010 | May | 10 |
| 2008 | Jun | 10 |
| 2007 | May | 10 |
| 2006 | May | 20 |
| 2005 | May | 20 |
| 2004 | May | 20 |
| 2003 | Jun | 20 |
| 2002 | Jul | 20 |
| 2001 | May | 20 |
| 2000 | Mar | 25 |
| 1999 | Apr | 25 |
| 1998 | May | 25 |
| 1997 | May | 25 |