| Current (3) |
| Board of Directors | 2022 |
| Chairman | 2022 |
| Board of Directors | 2023 |
| Former (23) |
| Chairman | 1959 – 1993 |
| Board of Directors | 1997 – 2000 |
| Chairman | 1997 – 1998 |
| Board of Directors | 1959 – 1993 |
| Board of Directors | 2008 – 2016 |
| Board of Directors | 1959 – 1998 |
| Board of Directors | 1959 – 1991 |
| Board of Directors | 1993 – 1996 |
| Chairman | 1959 – 1997 |
| Board of Directors | 2010 – 2016 |
| Board of Directors | 1998 – 2002 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 1996 – 1997 |
| Chairman | 2010 – 2016 |
| Board of Directors | 2009 – 2020 |
| Board of Directors | 2011 – 2020 |
| Board of Directors | 2000 – 2009 |
| Board of Directors | 1993 – 1994 |
| Board of Directors | 1959 – 2011 |
| Chairman | 2016 – 2022 |
| Board of Directors | 2016 – 2022 |
| Board of Directors | 1959 – 2000 |
| Board of Directors | 2002 – 2002 |
