| Current (3) |
| Board of Directors | 2025 |
| Chairman | 2025 |
| Board of Directors | 2023 |
| Former (19) |
| Chairman | 2003 – 2005 |
| Chairman | 2020 – 2022 |
| Chairman | 1968 – 1998 |
| Chairman | 1968 – 1996 |
| Chairman | 2013 – 2015 |
| Chairman | 2001 – 2003 |
| Board of Directors | 2023 – 2025 |
| Chairman | 2018 – 2020 |
| Chairman | 2015 – 2017 |
| Chairman | 1998 – 2001 |
| Board of Directors | 2010 – 2020 |
| Chairman | 2008 – 2012 |
| Chairman | 2022 – 2025 |
| Board of Directors | 1968 – 2001 |
| Chairman | 2005 – 2008 |
| Chairman | 2017 – 2018 |
| Chairman | 2012 – 2013 |
| Board of Directors | 2001 – 2010 |
| Board of Directors | 2020 – 2023 |