| Current (2) |
| Board of Directors | 2026 |
| Chairman | 2016 |
| Former (24) |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 2006 – 2011 |
| Board of Directors | 1982 – 2005 |
| Board of Directors | 1982 – 1987 |
| Board of Directors | 2005 – 2006 |
| Board of Directors | 2011 – 2014 |
| Board of Directors | 2022 – 2026 |
| Board of Directors | 2016 – 2022 |
| Board of Directors | 1982 – 1995 |
| Board of Directors | 1982 – 1989 |
| Board of Directors | 2005 – 2014 |
| Board of Directors | 1982 – 1988 |
| Board of Directors | 1982 – 1988 |
| Board of Directors | 1982 – 1991 |
| Chairman | 1982 – 1991 |
| Board of Directors | 1982 – 2000 |
| Chairman | 2014 – 2016 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 2006 – 2016 |
| Board of Directors | 1982 – 1987 |
| Board of Directors | 1982 – 1987 |
| Board of Directors | 1982 – 2005 |
| Chairman | 1982 – 2006 |
| Board of Directors | 2006 – 2014 |