| Chairman | 1988 – 1993 |
| Board of Directors | 1988 – 1995 |
| Board of Directors | 1988 – 1991 |
| Chairman | 1996 – 1998 |
| Board of Directors | 1988 – 1991 |
| Chairman | 1988 – 1995 |
| Board of Directors | 1995 – 1998 |
| Board of Directors | 1988 – 1998 |
| Board of Directors | 1988 – 1991 |
| Deputy Chairman | 1988 – 1998 |
| Chairman | 1988 – 1990 |
| Board of Directors | 1995 – 1998 |
| Board of Directors | 1988 – 1995 |
| Board of Directors | 1988 – 1993 |
| Board of Directors | 1988 – 1998 |
| Board of Directors | 1993 – 1996 |