| Chairman | 2020 – 2020 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 1999 – 1999 |
| Board of Directors | 1986 – 1998 |
| Board of Directors | 2020 – 2026 |
| Board of Directors | 1986 – 1999 |
| Chairman | 2021 – 2026 |
| Board of Directors | 2019 – 2020 |
| Chairman | 2020 – 2021 |
| Chairman | 2001 – 2004 |
| Board of Directors | 1993 – 1995 |
| Chairman | 2004 – 2013 |
| Board of Directors | 1986 – 1989 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 2004 – 2019 |
| Board of Directors | 2001 – 2020 |
| Board of Directors | 1986 – 2004 |
| Board of Directors | 2001 – 2004 |
| Chairman | 2013 – 2020 |
| Chairman | 2021 – 2021 |