| Year | Month | Dividend (%) |
|---|---|---|
| 2018 | Apr | 110 |
| 2017 | May | 105 |
| 2016 | May | 100 |
| 2015 | May | 90 |
| 2014 | May | 85 |
| 2013 | May | 80 |
| 2012 | Sep | 50 |
| 2012 | May | 75 |
| 2011 | May | 65 |
| 2010 | May | 65 |
| 2009 | May | 65 |
| 2008 | Apr | 55 |
| 2007 | Apr | 35 |
| 2006 | Apr | 32 |
| 2005 | Apr | 30 |
| 2004 | Apr | 29 |
| 2003 | Apr | 29 |
| 2002 | Apr | 29 |
| 2001 | Apr | 29 |
| 2000 | Mar | 28 |
| 1999 | Aug | 28 |
| 1998 | Jun | 28 |
| 1997 | Jul | 28 |