| Former (16) |
| Management | 1964 – 1989 |
| Management | 2022 – 2024 |
| Chief Executive Officer | 2011 – 2014 |
| Management | 1964 – 1997 |
| Chief Executive Officer | 2007 – 2011 |
| Management | 1964 – 1991 |
| Chief Executive Officer | 2001 – 2002 |
| Chief Executive Officer | 2024 – 2025 |
| Chief Executive Officer | 2018 – 2019 |
| Chief Executive Officer | 2014 – 2018 |
| Management | 1997 – 1998 |
| Management | 2002 – 2007 |
| Chief Executive Officer | 2019 – 2022 |
| Audit | 1964 – 1992 |
| Chief Executive Officer | 1998 – 1999 |
| Management | 1964 – 2001 |
