| Current (2) |
| Board of Directors | 2021 |
| Chairman | 2024 |
| Former (23) |
| Board of Directors | 2016 – 2019 |
| Board of Directors | 2003 – 2004 |
| Chairman | 2021 – 2021 |
| Board of Directors | 2019 – 2021 |
| Board of Directors | 2016 – 2017 |
| Chairman | 2003 – 2004 |
| Chairman | 1996 – 2000 |
| Board of Directors | 2017 – 2019 |
| Chairman | 1981 – 1996 |
| Board of Directors | 2003 – 2004 |
| Board of Directors | 2003 – 2009 |
| Board of Directors | 1981 – 1998 |
| Board of Directors | 2004 – 2012 |
| Board of Directors | 1998 – 2003 |
| Board of Directors | 2012 – 2016 |
| Board of Directors | 2004 – 2009 |
| Chairman | 2021 – 2023 |
| Board of Directors | 2011 – 2016 |
| Chairman | 2016 – 2018 |
| Chairman | 2023 – 2024 |
| Chairman | 2018 – 2021 |
| Chairman | 2004 – 2016 |
| Chairman | 2000 – 2003 |