| Current (3) |
| Board of Directors | 2021 |
| Board of Directors | 2023 |
| Chairman | 2017 |
| Former (12) |
| Board of Directors | 2020 – 2023 |
| Board of Directors | 2013 – 2020 |
| Board of Directors | 1945 – 1989 |
| Board of Directors | 2017 – 2021 |
| Board of Directors | 1945 – 1991 |
| Board of Directors | 1945 – 1991 |
| Board of Directors | 1945 – 1990 |
| Chairman | 1945 – 1991 |
| Board of Directors | 1945 – 2009 |
| Chairman | 1945 – 2012 |
| Board of Directors | 2012 – 2017 |
| Board of Directors | 2009 – 2013 |