| Current (3) |
| Board of Directors | 2015 |
| Chairman | 2024 |
| Board of Directors | 2024 |
| Former (18) |
| Board of Directors | 1988 – 2003 |
| Board of Directors | 2014 – 2015 |
| Chairman | 1988 – 2005 |
| Board of Directors | 1988 – 1993 |
| Chairman | 1988 – 1989 |
| Board of Directors | 1988 – 1994 |
| Board of Directors | 2005 – 2014 |
| Board of Directors | 2017 – 2019 |
| Board of Directors | 2019 – 2024 |
| Deputy Chairman | 1988 – 1989 |
| Chairman | 2015 – 2017 |
| Board of Directors | 1988 – 1994 |
| Board of Directors | 1988 – 1994 |
| Board of Directors | 1988 – 1991 |
| Board of Directors | 1988 – 1989 |
| Chairman | 2014 – 2015 |
| Board of Directors | 2001 – 2023 |
| Chairman | 2005 – 2014 |