| Current (5) |
| Chairman | 2020 |
| Board of Directors | 2021 |
| Deputy Chairman | 2017 |
| Board of Directors | 2021 |
| Board of Directors | 2017 |
| Former (19) |
| Chairman | 1970 – 2008 |
| Board of Directors | 2003 – 2005 |
| Board of Directors | 2013 – 2017 |
| Board of Directors | 2005 – 2017 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 1970 – 1993 |
| Board of Directors | 1998 – 2000 |
| Chairman | 2019 – 2020 |
| Board of Directors | 2013 – 2017 |
| Board of Directors | 1970 – 1991 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 1970 – 1991 |
| Chairman | 1970 – 1990 |
| Chairman | 1970 – 1991 |
| Board of Directors | 1970 – 1988 |
| Chairman | 2017 – 2019 |
| Board of Directors | 2008 – 2013 |
| Board of Directors | 1970 – 1988 |
| Board of Directors | 1970 – 1998 |