| Current (2) |
| Board of Directors | 2019 |
| Chairman | 2019 |
| Former (12) |
| Chairman | 2001 – 2002 |
| Board of Directors | 1998 – 2002 |
| Board of Directors | 1982 – 1998 |
| Board of Directors | 1982 – 1991 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 1982 – 2002 |
| Board of Directors | 1998 – 2002 |
| Board of Directors | 1982 – 1993 |
| Chairman | 2015 – 2019 |
| Board of Directors | 1982 – 1994 |
| Board of Directors | 1982 – 1991 |
| Board of Directors | 1982 – 1993 |