| Current (2) |
| Chairman | 2026 |
| Board of Directors | 2026 |
| Former (23) |
| Board of Directors | 1980 – 1993 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 2001 – 2001 |
| Board of Directors | 1980 – 1997 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 1980 – 1995 |
| Board of Directors | 1997 – 1999 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 1980 – 1993 |
| Chairman | 2003 – 2003 |
| Board of Directors | 1995 – 1997 |
| Board of Directors | 1980 – 2000 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 1980 – 1993 |
| Board of Directors | 1980 – 1995 |
| Board of Directors | 2000 – 2004 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 2019 – 2020 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 2008 – 2019 |
| Board of Directors | 2004 – 2008 |
| Chairman | 2003 – 2026 |
| Board of Directors | 1996 – 1999 |
