| Current (2) |
| Chairman | 2024 |
| Board of Directors | 2021 |
| Former (14) |
| Board of Directors | 1988 – 1991 |
| Board of Directors | 2004 – 2015 |
| Board of Directors | 1988 – 1988 |
| Board of Directors | 1988 – 1993 |
| Board of Directors | 1988 – 1993 |
| Board of Directors | 1988 – 1993 |
| Board of Directors | 1988 – 1991 |
| Board of Directors | 1988 – 1993 |
| Deputy Chairman | 1988 – 1997 |
| Board of Directors | 1988 – 1993 |
| Board of Directors | 2002 – 2004 |
| Chairman | 1988 – 1988 |
| Chairman | 2002 – 2021 |
| Board of Directors | 2015 – 2018 |