| Year | Month | Dividend (%) |
|---|---|---|
| 2019 | May | 10 |
| 2018 | May | 10 |
| 2017 | Jun | 20 |
| 2016 | May | 10 |
| 2015 | Jun | 10 |
| 2011 | May | 25 |
| 2010 | May | 25 |
| 2009 | Jul | 5 |
| 2008 | Apr | 20 |
| 2007 | Mar | 20 |
| 2006 | Apr | 20 |
| 2005 | Apr | 20 |
| 2004 | Jun | 20 |
| 2003 | May | 10 |
| 2002 | Jul | 20 |
| 2001 | May | 20 |
| 2000 | Apr | 30 |
| 1999 | May | 20 |
| 1997 | Jun | 15 |