| Former (16) |
| Chief Executive Officer | 2004 – 2007 |
| Unofficial title | 2003 – 2005 |
| Management | 2004 – 2007 |
| Unofficial title | 1939 – 1999 |
| Management | 2007 – 2007 |
| Management | 1939 – 2004 |
| Unofficial title | 1999 – 2003 |
| Management | 1939 – 1996 |
| Unofficial title | 1939 – 2003 |
| Management | 1939 – 1997 |
| Unofficial title | 2003 – 2005 |
| Unofficial title | 2003 – 2005 |
| Management | 2007 – 2007 |
| Unofficial title | 1939 – 1995 |
| Unofficial title | 1939 – 1995 |
| Unofficial title | 1939 – 1995 |