| Former (15) |
| Chairman | 1999 – 2004 |
| Board of Directors | 2018 – 2024 |
| Board of Directors | 1978 – 1990 |
| Board of Directors | 1978 – 2004 |
| Board of Directors | 2013 – 2017 |
| Board of Directors | 2017 – 2018 |
| Board of Directors | 1978 – 1999 |
| Board of Directors | 2006 – 2013 |
| Board of Directors | 2012 – 2014 |
| Chairman | 2023 – 2024 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 2013 – 2014 |
| Chairman | 2012 – 2023 |
| Board of Directors | 2014 – 2016 |
| Board of Directors | 1978 – 2004 |