| Year | Month | Dividend (%) |
|---|---|---|
| 2017 | May | 10 |
| 2015 | May | 18 |
| 2014 | May | 18 |
| 2013 | May | 15 |
| 2012 | May | 15 |
| 2011 | May | 15 |
| 2010 | Jun | 12 |
| 2009 | Jul | 12 |
| 2008 | Aug | 12 |
| 2007 | Sep | 12 |
| 2006 | Sep | 12 |
| 2004 | Aug | 14 |
| 2003 | Aug | 17 |
| 2002 | Jul | 20 |
| 2001 | Aug | 25 |
| 2000 | May | 25 |
| 1999 | Aug | 25 |
| 1998 | Jul | 22 |
| 1997 | Jul | 20 |