| Former (29) |
| Board of Directors | 2001 – 2001 |
| Board of Directors | 1980 – 1994 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 1998 – 1999 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 1980 – 1989 |
| Chairman | 2003 – 2003 |
| Board of Directors | 1980 – 1988 |
| Board of Directors | 1980 – 1994 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1980 – 1988 |
| Board of Directors | 1980 – 1990 |
| Board of Directors | 1980 – 1994 |
| Board of Directors | 1980 – 1993 |
| Chairman | 1998 – 2000 |
| Board of Directors | 2000 – 2004 |
| Board of Directors | 1996 – 1998 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 1980 – 1989 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 2014 – 2017 |
| Chairman | 1980 – 1998 |
| Chairman | 2014 – 2015 |
| Board of Directors | 1980 – 1990 |
| Board of Directors | 2008 – 2014 |
| Chairman | 2003 – 2014 |
| Board of Directors | 1980 – 1992 |
| Board of Directors | 1980 – 1995 |