| Current (2) |
| Chairman | 2018 |
| Deputy Chairman | 2025 |
| Former (26) |
| Chairman | 2015 – 2016 |
| Board of Directors | 1940 – 1989 |
| Board of Directors | 1940 – 1989 |
| Board of Directors | 1940 – 1999 |
| Board of Directors | 2015 – 2020 |
| Board of Directors | 2000 – 2004 |
| Chairman | 2011 – 2012 |
| Board of Directors | 1940 – 1988 |
| Board of Directors | 1940 – 1999 |
| Board of Directors | 1940 – 1988 |
| Board of Directors | 2002 – 2007 |
| Board of Directors | 2011 – 2013 |
| Chairman | 2016 – 2018 |
| Deputy Chairman | 2012 – 2013 |
| Chairman | 2012 – 2013 |
| Chairman | 1940 – 1993 |
| Board of Directors | 2013 – 2015 |
| Board of Directors | 2005 – 2011 |
| Deputy Chairman | 2005 – 2011 |
| Board of Directors | 2002 – 2005 |
| Board of Directors | 2018 – 2018 |
| Chairman | 2000 – 2011 |
| Board of Directors | 1940 – 2000 |
| Board of Directors | 2013 – 2015 |
| Board of Directors | 2018 – 2022 |
| Board of Directors | 1999 – 1999 |