| Current (4) |
| Chairman | 2019 |
| Board of Directors | 2022 |
| Board of Directors | 2021 |
| Board of Directors | 2025 |
| Former (19) |
| Board of Directors | 2021 – 2025 |
| Board of Directors | 1999 – 2004 |
| Board of Directors | 1962 – 2015 |
| Board of Directors | 1998 – 2005 |
| Chairman | 2017 – 2019 |
| Chairman | 2015 – 2017 |
| Board of Directors | 1962 – 1998 |
| Board of Directors | 2015 – 2021 |
| Board of Directors | 2015 – 2016 |
| Board of Directors | 1962 – 2017 |
| Board of Directors | 2017 – 2018 |
| Board of Directors | 1962 – 2002 |
| Board of Directors | 2021 – 2022 |
| Board of Directors | 1995 – 2017 |
| Board of Directors | 2020 – 2020 |
| Board of Directors | 1962 – 1999 |
| Board of Directors | 2019 – 2020 |
| Board of Directors | 2004 – 2021 |
| Chairman | 2005 – 2015 |