| Current (1) |
| Chief Auditor | 2024 |
| Former (13) |
| External Signatory | 2010 – 2022 |
| External Signatory | 2010 – 2018 |
| External Signatory | 2008 – 2010 |
| External Signatory | 2007 – 2008 |
| External Signatory | 2008 – 2010 |
| External Signatory | 2007 – 2008 |
| External Signatory | 2008 – 2010 |
| Chief Auditor | 2018 – 2024 |
| External Signatory | 2007 – 2008 |
| External Signatory | 2007 – 2008 |
| External Signatory | 2018 – 2022 |
| Chief Auditor | 2007 – 2018 |
| External Signatory | 2010 – 2018 |