| Current (2) |
| Management | 2019 |
| Chief Executive Officer | 2018 |
| Former (23) |
| Management | 2008 – 2009 |
| Deputy | 2002 – 2007 |
| Deputy | 2002 – 2007 |
| Deputy | 2007 – 2011 |
| Management | 2008 – 2014 |
| Chief Executive Officer | 2014 – 2018 |
| Deputy | 2007 – 2011 |
| Management | 2011 – 2015 |
| Deputy | 1998 – 2002 |
| Management | 2011 – 2013 |
| Audit | 1982 – 1998 |
| Deputy | 2002 – 2007 |
| Management | 1982 – 2000 |
| Management | 1982 – 1992 |
| Chief Executive Officer | 2000 – 2002 |
| Management | 2006 – 2010 |
| Management | 2008 – 2019 |
| Management | 2008 – 2011 |
| Chief Executive Officer | 2002 – 2002 |
| Management | 2002 – 2007 |
| Management | 2016 – 2020 |
| Deputy | 1998 – 2000 |
| Management | 2015 – 2020 |