| Current (2) |
| Chairman | 2020 |
| Deputy Chairman | 2020 |
| Former (15) |
| Board of Directors | 1992 – 1997 |
| Chairman | 2004 – 2009 |
| Chairman | 2003 – 2003 |
| Chairman | 2018 – 2020 |
| Deputy Chairman | 2010 – 2013 |
| Deputy Chairman | 2009 – 2010 |
| Chairman | 2003 – 2004 |
| Deputy Chairman | 2013 – 2014 |
| Deputy Chairman | 2014 – 2017 |
| Chairman | 2009 – 2016 |
| Deputy Chairman | 2017 – 2018 |
| Chairman | 2004 – 2004 |
| Board of Directors | 2003 – 2010 |
| Chairman | 2016 – 2018 |
| Board of Directors | 1992 – 2008 |