| Current (2) |
| Chairman | 2016 |
| Board of Directors | 2022 |
| Former (16) |
| Board of Directors | 1976 – 1990 |
| Board of Directors | 1976 – 1992 |
| Board of Directors | 1976 – 1988 |
| Board of Directors | 2021 – 2022 |
| Deputy Chairman | 2013 – 2016 |
| Board of Directors | 1976 – 1994 |
| Board of Directors | 2016 – 2021 |
| Board of Directors | 1976 – 1988 |
| Board of Directors | 2000 – 2003 |
| Board of Directors | 2013 – 2015 |
| Chairman | 2013 – 2016 |
| Board of Directors | 1976 – 2000 |
| Board of Directors | 1976 – 1994 |
| Chairman | 2006 – 2013 |
| Chairman | 1976 – 1997 |
| Board of Directors | 1976 – 1994 |
