| Current (6) |
| Chairman | 2024 |
| Board of Directors | 2020 |
| Deputy Chairman | 2024 |
| Board of Directors | 2020 |
| Board of Directors | 2015 |
| Board of Directors | 1998 |
| Former (12) |
| Deputy Chairman | 1952 – 1997 |
| Board of Directors | 1952 – 1990 |
| Deputy Chairman | 2006 – 2016 |
| Board of Directors | 2006 – 2019 |
| Deputy Chairman | 1952 – 2003 |
| Board of Directors | 1992 – 1997 |
| Board of Directors | 1952 – 1992 |
| Chairman | 2003 – 2024 |
| Deputy Chairman | 2003 – 2006 |
| Board of Directors | 2001 – 2003 |
| Board of Directors | 1952 – 1988 |
| Board of Directors | 1952 – 2001 |