| Board of Directors | 1981 – 1991 |
| Board of Directors | 1981 – 1991 |
| Chairman | 2005 – 2008 |
| Board of Directors | 2009 – 2011 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 2001 – 2005 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 1998 – 2005 |
| Chairman | 2002 – 2005 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 2008 – 2009 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 2005 – 2011 |
| Board of Directors | 2005 – 2008 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 1981 – 1998 |
| Board of Directors | 2005 – 2005 |
| Board of Directors | 2011 – 2011 |
| Deputy Chairman | 1981 – 1989 |
| Board of Directors | 1981 – 1989 |
| Board of Directors | 1981 – 1988 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 1981 – 1989 |