| Current (3) |
| Board of Directors | 2026 |
| Board of Directors | 2024 |
| Chairman | 2023 |
| Former (16) |
| Board of Directors | 1972 – 1991 |
| Board of Directors | 1972 – 2024 |
| Chairman | 2020 – 2023 |
| Board of Directors | 1972 – 1998 |
| Board of Directors | 2018 – 2020 |
| Board of Directors | 2001 – 2003 |
| Chairman | 2014 – 2020 |
| Chairman | 1972 – 1999 |
| Chairman | 1972 – 1996 |
| Board of Directors | 1972 – 1991 |
| Board of Directors | 2020 – 2024 |
| Board of Directors | 2023 – 2024 |
| Board of Directors | 2005 – 2018 |
| Chairman | 2000 – 2007 |
| Chairman | 2007 – 2014 |
| Board of Directors | 2000 – 2000 |