| Current (3) |
| Board of Directors | 2020 |
| Chairman | 2020 |
| Board of Directors | 2021 |
| Former (19) |
| Board of Directors | 2019 – 2021 |
| Chairman | 2011 – 2013 |
| Board of Directors | 1937 – 1988 |
| Board of Directors | 1937 – 2006 |
| Chairman | 2013 – 2018 |
| Board of Directors | 2008 – 2013 |
| Chairman | 2018 – 2020 |
| Board of Directors | 1937 – 1991 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 1937 – 1995 |
| Deputy Chairman | 1937 – 1989 |
| Board of Directors | 2006 – 2018 |
| Board of Directors | 1937 – 2004 |
| Deputy Chairman | 1937 – 1993 |
| Chairman | 2013 – 2013 |
| Board of Directors | 2021 – 2021 |
| Board of Directors | 2018 – 2020 |
| Chairman | 1998 – 2008 |
| Board of Directors | 1998 – 2002 |