| Year | Month | Dividend (%) |
|---|---|---|
| 2019 | May | 25 |
| 2018 | May | 30 |
| 2017 | May | 25 |
| 2016 | May | 50 |
| 2015 | May | 25 |
| 2014 | May | 50 |
| 2013 | May | 75 |
| 2012 | May | 125 |
| 2011 | Aug | 75 |
| 2010 | Aug | 50 |
| 2009 | Aug | 100 |
| 2008 | Jul | 100 |
| 2007 | Nov | 100 |
| 2007 | Jul | 50 |
| 2007 | Feb | 100 |
| 2006 | Jun | 125 |
| 2005 | Oct | 75 |
| 2005 | Jul | 60 |
| 2005 | Jan | 40 |
| 2004 | Jun | 40 |
| 2003 | Jul | 12 |
| 2002 | Jul | 18 |
| 2001 | Jun | 12 |
| 1999 | Jul | 18 |
| 1998 | Jul | 12 |
| 1997 | Aug | 10 |