| Current (2) |
| Chairman | 2026 |
| Board of Directors | 2024 |
| Former (28) |
| Chairman | 2005 – 2006 |
| Board of Directors | 1941 – 1989 |
| Chairman | 2013 – 2015 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 1941 – 1990 |
| Board of Directors | 1941 – 2000 |
| Board of Directors | 2010 – 2011 |
| Board of Directors | 1941 – 1993 |
| Board of Directors | 2000 – 2003 |
| Board of Directors | 2009 – 2013 |
| Board of Directors | 2019 – 2024 |
| Chairman | 2003 – 2005 |
| Board of Directors | 1941 – 1999 |
| Board of Directors | 1941 – 1998 |
| Board of Directors | 2003 – 2010 |
| Board of Directors | 1941 – 1997 |
| Chairman | 2006 – 2013 |
| Board of Directors | 1941 – 1997 |
| Chairman | 2016 – 2019 |
| Chairman | 2024 – 2025 |
| Board of Directors | 1941 – 1997 |
| Board of Directors | 1941 – 1990 |
| Chairman | 2015 – 2016 |
| Board of Directors | 2013 – 2017 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 2005 – 2006 |
| Board of Directors | 2017 – 2019 |
| Board of Directors | 2011 – 2012 |