| Chairman | 1990 – 1999 |
| Board of Directors | 1990 – 2008 |
| Board of Directors | 1997 – 2007 |
| Board of Directors | 1990 – 1994 |
| Board of Directors | 1990 – 1994 |
| Board of Directors | 1990 – 1996 |
| Chairman | 1990 – 2009 |
| Board of Directors | 1990 – 1993 |
| Board of Directors | 1990 – 1997 |
| Board of Directors | 1990 – 1994 |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 2007 – 2009 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 2000 – 2009 |
| Deputy Chairman | 2002 – 2009 |
| Board of Directors | 1999 – 2006 |
| Board of Directors | 1990 – 2008 |
| Board of Directors | 1990 – 1994 |
| Deputy Chairman | 1990 – 2002 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 1999 – 2009 |
| Board of Directors | 1990 – 1994 |
| Deputy Chairman | 1990 – 1994 |
| Board of Directors | 2008 – 2009 |
| Chairman | 1990 – 1995 |
| Board of Directors | 1990 – 2000 |
| Board of Directors | 1990 – 2007 |
| Board of Directors | 1990 – 1992 |
| Board of Directors | 1990 – 2001 |
| Board of Directors | 1990 – 1990 |