| Year | Month | Dividend (%) |
|---|---|---|
| 2016 | May | 50 |
| 2015 | May | 70 |
| 2014 | May | 70 |
| 2013 | May | 65 |
| 2012 | May | 60 |
| 2011 | May | 55 |
| 2010 | May | 50 |
| 2009 | Apr | 40 |
| 2008 | Apr | 58 |
| 2007 | Mar | 55 |
| 2006 | Apr | 50 |
| 2005 | Apr | 40 |
| 2004 | Apr | 40 |
| 2003 | Apr | 38 |
| 2002 | May | 33 |
| 2001 | Apr | 30 |
| 2000 | Apr | 10 |
| 1999 | Jun | 40 |
| 1998 | May | 50 |
| 1997 | May | 68 |