| Current (2) |
| Chairman | 2008 |
| Board of Directors | 2017 |
| Former (15) |
| Deputy Chairman | 1984 – 1996 |
| Board of Directors | 1984 – 2005 |
| Board of Directors | 1984 – 1996 |
| Board of Directors | 2017 – 2021 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 1984 – 1987 |
| Board of Directors | 1984 – 2005 |
| Chairman | 1984 – 1992 |
| Chairman | 1984 – 1996 |
| Board of Directors | 1984 – 1988 |
| Board of Directors | 2011 – 2017 |
| Board of Directors | 1984 – 1992 |
| Chairman | 2005 – 2008 |
| Board of Directors | 2005 – 2008 |
| Board of Directors | 1984 – 1988 |