| Former (18) |
| Chairman | 2012 – 2017 |
| Board of Directors | 2012 – 2020 |
| Chairman | 1997 – 2003 |
| Chairman | 2008 – 2008 |
| Chairman | 2011 – 2012 |
| Chairman | 1978 – 1993 |
| Board of Directors | 2008 – 2008 |
| Board of Directors | 2022 – 2023 |
| Board of Directors | 2012 – 2012 |
| Board of Directors | 1978 – 1993 |
| Board of Directors | 1978 – 2003 |
| Board of Directors | 2008 – 2012 |
| Chairman | 2003 – 2008 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 1978 – 1999 |
| Board of Directors | 2003 – 2008 |
| Board of Directors | 2003 – 2004 |
| Chairman | 2017 – 2023 |