| Former (25) |
| Chairman | 2006 – 2013 |
| Board of Directors | 1971 – 1988 |
| Chairman | 2001 – 2003 |
| Board of Directors | 2016 – 2017 |
| Board of Directors | 1971 – 1993 |
| Board of Directors | 2001 – 2003 |
| Board of Directors | 2002 – 2004 |
| Chairman | 2004 – 2016 |
| Board of Directors | 2006 – 2013 |
| Board of Directors | 2017 – 2019 |
| Chairman | 2017 – 2019 |
| Board of Directors | 2016 – 2017 |
| Board of Directors | 2002 – 2004 |
| Chairman | 1971 – 2001 |
| Board of Directors | 2013 – 2015 |
| Deputy Chairman | 1971 – 2001 |
| Chairman | 2003 – 2006 |
| Chairman | 2013 – 2014 |
| Deputy Chairman | 2005 – 2006 |
| Chairman | 2019 – 2023 |
| Chairman | 2016 – 2017 |
| Deputy Chairman | 2001 – 2004 |
| Deputy Chairman | 2004 – 2005 |
| Board of Directors | 1971 – 1993 |
| Board of Directors | 1971 – 2001 |