| Current (1) |
| Chief Executive Officer | 2021 |
| Former (20) |
| Deputy | 2002 – 2002 |
| Chief Executive Officer | 1998 – 2000 |
| Chief Executive Officer | 2007 – 2008 |
| Audit | 1989 – 1990 |
| Chief Executive Officer | 2012 – 2021 |
| Management | 2001 – 2002 |
| Management | 2000 – 2002 |
| Management | 2003 – 2006 |
| Management | 1989 – 1992 |
| Management | 1989 – 1998 |
| Deputy | 1998 – 2002 |
| Chief Executive Officer | 2008 – 2012 |
| Deputy | 1989 – 1997 |
| Deputy | 1989 – 1994 |
| Chief Executive Officer | 2002 – 2003 |
| Deputy | 1989 – 1998 |
| Management | 1989 – 1990 |
| Deputy | 2002 – 2002 |
| Management | 1989 – 1990 |
| Management | 1999 – 1999 |