| Current (4) |
| Chairman | 2019 |
| Board of Directors | 2024 |
| Board of Directors | 2023 |
| Board of Directors | 2020 |
| Former (18) |
| Board of Directors | 1980 – 1989 |
| Board of Directors | 1980 – 2013 |
| Chairman | 2013 – 2015 |
| Board of Directors | 1980 – 1989 |
| Board of Directors | 2002 – 2005 |
| Chairman | 2015 – 2016 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 2005 – 2011 |
| Board of Directors | 1980 – 2001 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 1999 – 2002 |
| Board of Directors | 2016 – 2018 |
| Board of Directors | 1980 – 1989 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 1980 – 1991 |
| Chairman | 2016 – 2019 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 1980 – 1990 |