| Board of Directors | 1997 – 2000 |
| Board of Directors | 1993 – 1993 |
| Board of Directors | 1968 – 1988 |
| Board of Directors | 1993 – 1993 |
| Board of Directors | 1968 – 1996 |
| Chairman | 2017 – 2018 |
| Board of Directors | 1968 – 1991 |
| Chairman | 2014 – 2017 |
| Board of Directors | 1996 – 1996 |
| Chairman | 1968 – 1996 |
| Board of Directors | 2003 – 2012 |
| Chairman | 2019 – 2023 |
| Board of Directors | 2020 – 2023 |
| Board of Directors | 1996 – 2000 |
| Board of Directors | 1968 – 1993 |
| Board of Directors | 2000 – 2003 |
| Board of Directors | 1968 – 1993 |
| Board of Directors | 2020 – 2023 |
| Board of Directors | 1968 – 1993 |
| Board of Directors | 1996 – 2014 |
| Chairman | 2012 – 2014 |
| Chairman | 2018 – 2019 |
| Board of Directors | 1968 – 1996 |
| Board of Directors | 1968 – 1996 |