| Former (16) |
| Chairman | 1999 – 2003 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 2007 – 2008 |
| Board of Directors | 1971 – 1988 |
| Board of Directors | 1993 – 1997 |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 1971 – 1993 |
| Board of Directors | 1971 – 1993 |
| Board of Directors | 1993 – 1997 |
| Board of Directors | 1997 – 1999 |
| Chairman | 2007 – 2008 |
| Chairman | 2003 – 2007 |
| Board of Directors | 1971 – 1993 |
| Board of Directors | 1998 – 2006 |
| Board of Directors | 1997 – 1998 |