| Year | Month | Dividend (%) |
|---|---|---|
| 2015 | May | 30 |
| 2014 | May | 23 |
| 2013 | Aug | 30 |
| 2012 | Aug | 30 |
| 2011 | Aug | 35 |
| 2010 | Aug | 33 |
| 2009 | Aug | 30 |
| 2008 | Jul | 30 |
| 2007 | Jul | 50 |
| 2006 | Aug | 40 |
| 2005 | Oct | 35 |
| 2004 | Aug | 30 |
| 2003 | Sep | 30 |
| 2002 | Mar | 30 |
| 2001 | Apr | 28 |
| 2000 | Apr | 25 |
| 1999 | Apr | 20 |
| 1998 | May | 18 |
| 1997 | May | 18 |