| Current (2) |
| Board of Directors | 2023 |
| Chairman | 2023 |
| Former (16) |
| Chairman | 1986 – 2002 |
| Board of Directors | 2016 – 2017 |
| Board of Directors | 1986 – 2013 |
| Board of Directors | 2015 – 2016 |
| Board of Directors | 2002 – 2015 |
| Chairman | 2018 – 2020 |
| Board of Directors | 2013 – 2015 |
| Chairman | 2017 – 2018 |
| Board of Directors | 2016 – 2017 |
| Chairman | 2002 – 2015 |
| Board of Directors | 2015 – 2016 |
| Chairman | 2017 – 2017 |
| Board of Directors | 2017 – 2018 |
| Chairman | 2015 – 2017 |
| Chairman | 2020 – 2023 |
| Board of Directors | 2017 – 2018 |