| Current (1) |
| Chief Executive Officer | 2023 |
| Former (21) |
| Deputy | 1980 – 1991 |
| Deputy | 1980 – 1998 |
| Management | 2015 – 2016 |
| Deputy | 1998 – 2002 |
| Deputy | 2002 – 2010 |
| Deputy | 1998 – 2002 |
| Management | 1980 – 1988 |
| Deputy | 2006 – 2010 |
| Management | 1980 – 2007 |
| Deputy | 2002 – 2006 |
| Deputy | 2006 – 2008 |
| Management | 2011 – 2015 |
| Management | 1980 – 1990 |
| Management | 1980 – 2008 |
| Management | 1980 – 1993 |
| Deputy | 1980 – 1991 |
| Management | 2007 – 2014 |
| Management | 1980 – 2007 |
| Management | 2015 – 2015 |
| Deputy | 1980 – 1991 |
| Management | 2007 – 2010 |
