| Current (3) |
| Board of Directors | 2012 |
| Chairman | 2016 |
| Board of Directors | 2023 |
| Former (18) |
| Chairman | 1998 – 2002 |
| Board of Directors | 1982 – 1991 |
| Board of Directors | 1982 – 1996 |
| Board of Directors | 1982 – 1993 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1982 – 1993 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1982 – 1988 |
| Board of Directors | 1996 – 1998 |
| Board of Directors | 1982 – 1991 |
| Board of Directors | 1996 – 1998 |
| Board of Directors | 1982 – 1993 |
| Board of Directors | 1982 – 1993 |
| Board of Directors | 2000 – 2002 |
| Chairman | 1982 – 1998 |
| Board of Directors | 1998 – 2012 |
| Board of Directors | 2005 – 2012 |
| Board of Directors | 1982 – 1991 |