| Chairman | 2006 – 2007 |
| Board of Directors | 1980 – 1987 |
| Board of Directors | 2006 – 2007 |
| Chairman | 1998 – 2002 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 1980 – 1993 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 1980 – 1999 |
| Board of Directors | 1980 – 1998 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 1980 – 1993 |
| Board of Directors | 1998 – 2002 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 1998 – 2004 |
| Board of Directors | 1980 – 1991 |
| Board of Directors | 2002 – 2004 |