| Year | Month | Dividend (%) |
|---|---|---|
| 2015 | May | 10 |
| 2014 | May | 30 |
| 2013 | May | 30 |
| 2012 | May | 33 |
| 2011 | May | 30 |
| 2010 | May | 25 |
| 2009 | Jun | 18 |
| 2008 | Jun | 40 |
| 2007 | Jul | 40 |
| 2006 | Jun | 35 |
| 2005 | May | 30 |
| 2004 | Jun | 25 |
| 2003 | May | 22 |
| 2002 | May | 27 |
| 2001 | May | 25 |
| 2000 | Mar | 25 |
| 1999 | May | 20 |
| 1998 | May | 20 |
| 1997 | Jun | 25 |