| Current (2) |
| Board of Directors | 2020 |
| Board of Directors | 2025 |
| Former (24) |
| Chairman | 2018 – 2020 |
| Board of Directors | 1996 – 2005 |
| Chairman | 1982 – 1998 |
| Board of Directors | 1982 – 1990 |
| Board of Directors | 1982 – 1999 |
| Board of Directors | 1982 – 1995 |
| Board of Directors | 1982 – 1998 |
| Chairman | 1998 – 2003 |
| Board of Directors | 1982 – 1996 |
| Chairman | 2008 – 2009 |
| Board of Directors | 2002 – 2005 |
| Board of Directors | 1982 – 2018 |
| Chairman | 2009 – 2015 |
| Board of Directors | 1999 – 2005 |
| Board of Directors | 1982 – 1992 |
| Board of Directors | 1982 – 1990 |
| Chairman | 1982 – 1995 |
| Board of Directors | 2018 – 2022 |
| Chairman | 2015 – 2018 |
| Chairman | 2005 – 2008 |
| Board of Directors | 1998 – 2002 |
| Board of Directors | 1982 – 1992 |
| Chairman | 2003 – 2005 |
| Board of Directors | 2022 – 2025 |