| Current (2) |
| Chairman | 2017 |
| Board of Directors | 2026 |
| Former (14) |
| Board of Directors | 1940 – 1988 |
| Chairman | 2014 – 2017 |
| Chairman | 1940 – 2005 |
| Board of Directors | 2016 – 2021 |
| Board of Directors | 2024 – 2026 |
| Deputy Chairman | 1940 – 1995 |
| Board of Directors | 1997 – 1997 |
| Chairman | 2005 – 2014 |
| Board of Directors | 2016 – 2019 |
| Chairman | 1940 – 1995 |
| Deputy Chairman | 1940 – 2001 |
| Board of Directors | 2021 – 2024 |
| Board of Directors | 1940 – 1997 |
| Board of Directors | 2005 – 2008 |