| Current (2) |
| Chairman | 2022 |
| Board of Directors | 2022 |
| Former (13) |
| Board of Directors | 1976 – 2022 |
| Chairman | 1999 – 2022 |
| Board of Directors | 1976 – 1999 |
| Board of Directors | 1996 – 2005 |
| Board of Directors | 2000 – 2020 |
| Board of Directors | 1976 – 1996 |
| Board of Directors | 1976 – 1994 |
| Board of Directors | 1996 – 2005 |
| Board of Directors | 1976 – 1994 |
| Board of Directors | 1976 – 1996 |
| Board of Directors | 1976 – 1996 |
| Board of Directors | 1976 – 1993 |
| Chairman | 1976 – 1996 |