| Chairman | 1990 – 2011 |
| Board of Directors | 1990 – 1991 |
| Board of Directors | 1996 – 2006 |
| Board of Directors | 2012 – 2012 |
| Deputy Chairman | 1990 – 1995 |
| Chairman | 2011 – 2012 |
| Board of Directors | 1990 – 2012 |
| Board of Directors | 2006 – 2012 |
| Board of Directors | 2012 – 2012 |
| Chairman | 2012 – 2012 |
| Chairman | 1990 – 1991 |
| Chairman | 1990 – 1995 |
| Board of Directors | 1990 – 1996 |
| Board of Directors | 1990 – 1991 |