| Current (3) |
| Board of Directors | 2025 |
| Chairman | 2024 |
| Board of Directors | 2022 |
| Former (20) |
| Chairman | 2005 – 2007 |
| Board of Directors | 2007 – 2008 |
| Board of Directors | 2010 – 2011 |
| Chairman | 2000 – 2003 |
| Board of Directors | 2005 – 2007 |
| Board of Directors | 2013 – 2022 |
| Chairman | 2008 – 2010 |
| Chairman | 1997 – 1999 |
| Board of Directors | 1997 – 2003 |
| Board of Directors | 1964 – 1988 |
| Board of Directors | 1964 – 1997 |
| Board of Directors | 1964 – 1997 |
| Chairman | 2003 – 2005 |
| Board of Directors | 1964 – 1997 |
| Chairman | 2007 – 2008 |
| Chairman | 2013 – 2022 |
| Chairman | 2010 – 2013 |
| Chairman | 2023 – 2024 |
| Chairman | 1999 – 2000 |
| Chairman | 2022 – 2023 |