| Year | Month | Dividend (%) |
|---|---|---|
| 2018 | May | 5 |
| 2017 | May | 5 |
| 2016 | May | 5 |
| 2015 | May | 10 |
| 2014 | Jun | 10 |
| 2013 | May | 10 |
| 2012 | Jun | 10 |
| 2011 | Jun | 5 |
| 2010 | May | 5 |
| 2009 | Jun | 5 |
| 2008 | Jun | 10 |
| 2007 | Jun | 5 |
| 2006 | Jun | 10 |
| 2005 | Jul | 5 |
| 2004 | Jun | 5 |
| 2003 | Jun | 5 |
| 2002 | Sep | 4 |
| 2001 | Jul | 8 |
| 2000 | Apr | 12 |
| 1999 | May | 4 |
| 1998 | Jun | 4 |
| 1997 | Jun | 6 |