| Current (8) |
| Management | 2018 |
| Management | 2018 |
| Management | 2018 |
| Management | 2018 |
| Management | 2018 |
| Management | 2018 |
| Management | 2018 |
| Management | 2018 |
| Former (12) |
| Stakeholder | 2004 – 2012 |
| Stakeholder | 1990 – 2014 |
| Stakeholder | 1980 – 2003 |
| Stakeholder | 1973 – 2000 |
| Stakeholder | 1976 – 2007 |
| Stakeholder | 2001 – 2010 |
| Stakeholder | 2010 – 2011 |
| Stakeholder | 1993 – 2016 |
| Stakeholder | 1990 – 2009 |
| Stakeholder | 1990 – 2003 |
| Management | 2018 – 2019 |
| Stakeholder | 2003 – 2011 |