| Board of Directors | 2011 – 2011 |
| Board of Directors | 1988 – 1996 |
| Board of Directors | 1997 – 2006 |
| Board of Directors | 1988 – 1997 |
| Board of Directors | 1999 – 2011 |
| Board of Directors | 2009 – 2011 |
| Board of Directors | 2007 – 2009 |
| Board of Directors | 1997 – 2006 |
| Board of Directors | 1988 – 1997 |
| Board of Directors | 1988 – 1996 |
| Board of Directors | 1988 – 1991 |
| Board of Directors | 1988 – 2006 |
| Board of Directors | 1988 – 1992 |
| Board of Directors | 2008 – 2011 |
| Deputy Chairman | 1988 – 2002 |
| Board of Directors | 2007 – 2008 |
| Deputy Chairman | 2008 – 2011 |
| Board of Directors | 1988 – 1991 |
| Board of Directors | 1988 – 2006 |
| Chairman | 2002 – 2011 |
| Board of Directors | 1988 – 1996 |