| Current (2) |
| Board of Directors | 2023 |
| Chairman | 2023 |
| Former (21) |
| Board of Directors | 1982 – 1993 |
| Board of Directors | 1982 – 1989 |
| Board of Directors | 1982 – 1998 |
| Board of Directors | 2019 – 2023 |
| Chairman | 1982 – 1993 |
| Board of Directors | 1982 – 1987 |
| Board of Directors | 1982 – 1990 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1982 – 1998 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 1982 – 1994 |
| Chairman | 1982 – 1987 |
| Board of Directors | 2007 – 2019 |
| Chairman | 2018 – 2019 |
| Chairman | 1998 – 2017 |
| Chairman | 1982 – 1989 |
| Chairman | 1982 – 1989 |
| Board of Directors | 2002 – 2007 |
| Chairman | 1982 – 1991 |
| Chairman | 2019 – 2023 |
| Chairman | 1982 – 1998 |