| Former (30) |
| Chairman | 2006 – 2025 |
| Board of Directors | 1947 – 1987 |
| Board of Directors | 1947 – 1992 |
| Board of Directors | 1947 – 1995 |
| Board of Directors | 1947 – 1994 |
| Board of Directors | 1947 – 1994 |
| Board of Directors | 1947 – 1991 |
| Board of Directors | 1994 – 1998 |
| Board of Directors | 1994 – 1996 |
| Chairman | 1947 – 1994 |
| Chairman | 1997 – 1998 |
| Board of Directors | 1947 – 1992 |
| Chairman | 1994 – 1997 |
| Board of Directors | 1947 – 1995 |
| Chairman | 1998 – 2006 |
| Board of Directors | 1947 – 1989 |
| Board of Directors | 1947 – 1987 |
| Board of Directors | 1947 – 1991 |
| Board of Directors | 1947 – 1987 |
| Board of Directors | 2008 – 2025 |
| Board of Directors | 1947 – 1998 |
| Board of Directors | 1998 – 2007 |
| Board of Directors | 2007 – 2008 |
| Board of Directors | 1947 – 2007 |
| Chairman | 1947 – 1992 |
| Board of Directors | 1947 – 2004 |
| Board of Directors | 1947 – 1998 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1992 – 1998 |
| Board of Directors | 1947 – 1987 |