| Year | Month | Dividend (%) |
|---|---|---|
| 2015 | May | 10 |
| 2014 | Aug | 10 |
| 2013 | Aug | 15 |
| 2012 | Aug | 25 |
| 2011 | Aug | 30 |
| 2010 | Aug | 25 |
| 2009 | Sep | 25 |
| 2008 | Aug | 35 |
| 2007 | Aug | 15 |
| 2007 | Jan | 15 |
| 2006 | Aug | 15 |
| 2006 | Jan | 13 |
| 2005 | Aug | 13 |
| 2005 | Jan | 13 |
| 2004 | Aug | 25 |
| 2003 | Aug | 20 |
| 2002 | Aug | 20 |
| 2001 | Jul | 30 |
| 2000 | Oct | 25 |
| 1999 | Aug | 12 |
| 1999 | Feb | 10 |
| 1997 | Jun | 25 |