| Former (15) |
| Management | 1977 – 1999 |
| Unofficial title | 2004 – 2004 |
| Management | 2001 – 2001 |
| Unofficial title | 1977 – 1998 |
| Unofficial title | 1977 – 1990 |
| Unofficial title | 1998 – 2001 |
| Chief Executive Officer | 1977 – 2001 |
| Unofficial title | 1977 – 1990 |
| Unofficial title | 1998 – 2001 |
| Unofficial title | 1977 – 1995 |
| Management | 2001 – 2004 |
| Management | 1977 – 1999 |
| Unofficial title | 1977 – 1995 |
| Management | 1977 – 1993 |
| Management | 1977 – 1999 |