| Current (2) |
| Board of Directors | 2024 |
| Chairman | 2026 |
| Former (22) |
| Board of Directors | 1980 – 1990 |
| Board of Directors | 1997 – 2008 |
| Board of Directors | 1996 – 2000 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 1980 – 1990 |
| Chairman | 2017 – 2026 |
| Board of Directors | 2001 – 2008 |
| Board of Directors | 2008 – 2012 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 2012 – 2018 |
| Board of Directors | 1996 – 1997 |
| Chairman | 2008 – 2017 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 2012 – 2018 |
| Board of Directors | 2018 – 2023 |
| Board of Directors | 1980 – 1993 |
| Board of Directors | 1980 – 1990 |
| Board of Directors | 1980 – 1990 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 2018 – 2023 |
| Board of Directors | 2023 – 2024 |