| Current (2) |
| Deputy Chairman | 2019 |
| Chairman | 2026 |
| Former (35) |
| Board of Directors | 2003 – 2007 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 2004 – 2014 |
| Board of Directors | 1982 – 1997 |
| Deputy Chairman | 2015 – 2019 |
| Chairman | 2021 – 2026 |
| Chairman | 1998 – 2003 |
| Board of Directors | 1982 – 2003 |
| Board of Directors | 1982 – 1992 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 2001 – 2008 |
| Board of Directors | 1993 – 1994 |
| Board of Directors | 1993 – 1994 |
| Board of Directors | 1982 – 1994 |
| Board of Directors | 1982 – 1990 |
| Board of Directors | 1982 – 1990 |
| Board of Directors | 2005 – 2008 |
| Board of Directors | 1982 – 1990 |
| Board of Directors | 1982 – 1990 |
| Chairman | 2013 – 2014 |
| Board of Directors | 1982 – 1995 |
| Chairman | 1982 – 1998 |
| Board of Directors | 1982 – 1993 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 1993 – 2001 |
| Board of Directors | 1982 – 1993 |
| Board of Directors | 1982 – 1993 |
| Deputy Chairman | 2003 – 2004 |
| Chairman | 2010 – 2013 |
| Board of Directors | 1982 – 2005 |
| Chairman | 2003 – 2007 |
| Chairman | 1982 – 1993 |
| Board of Directors | 2007 – 2008 |
| Chairman | 2015 – 2021 |
| Chairman | 2007 – 2010 |