| Current (2) |
| Chairman | 2023 |
| Board of Directors | 2026 |
| Former (18) |
| Board of Directors | 2006 – 2011 |
| Board of Directors | 1981 – 2006 |
| Board of Directors | 1981 – 2006 |
| Chairman | 2009 – 2010 |
| Board of Directors | 2011 – 2016 |
| Chairman | 2007 – 2009 |
| Board of Directors | 2006 – 2010 |
| Board of Directors | 1981 – 2006 |
| Chairman | 2011 – 2023 |
| Board of Directors | 2013 – 2013 |
| Chairman | 2011 – 2011 |
| Board of Directors | 2025 – 2026 |
| Board of Directors | 2024 – 2026 |
| Chairman | 2006 – 2007 |
| Chairman | 2010 – 2011 |
| Board of Directors | 2016 – 2020 |
| Board of Directors | 2011 – 2013 |
| Board of Directors | 2013 – 2025 |