| Current (2) |
| Board of Directors | 2026 |
| Chairman | 2026 |
| Former (17) |
| Chairman | 2019 – 2021 |
| Board of Directors | 1978 – 2000 |
| Board of Directors | 2011 – 2014 |
| Board of Directors | 2009 – 2011 |
| Board of Directors | 1978 – 1990 |
| Board of Directors | 1978 – 1997 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 2012 – 2015 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 1978 – 1990 |
| Board of Directors | 2024 – 2026 |
| Board of Directors | 1997 – 1998 |
| Board of Directors | 2009 – 2012 |
| Chairman | 2021 – 2026 |
| Board of Directors | 1978 – 2009 |
| Chairman | 1998 – 2009 |
| Chairman | 2009 – 2019 |