| Board of Directors | 1987 – 1987 |
| Chairman | 1987 – 1998 |
| Board of Directors | 1987 – 1999 |
| Deputy Chairman | 1987 – 1998 |
| Board of Directors | 2012 – 2017 |
| Board of Directors | 1987 – 1998 |
| Deputy Chairman | 2001 – 2017 |
| Chairman | 2012 – 2017 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1987 – 1991 |
| Board of Directors | 2001 – 2012 |
| Chairman | 1998 – 2000 |
| Board of Directors | 1987 – 1998 |
| Board of Directors | 1987 – 1991 |
| Board of Directors | 1987 – 1996 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 1987 – 1999 |
| Board of Directors | 1987 – 1998 |
| Board of Directors | 1999 – 2001 |
| Chairman | 2000 – 2001 |
| Chairman | 2001 – 2012 |
| Chairman | 1987 – 1987 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 1987 – 1987 |