| Current (3) |
| Board of Directors | 2022 |
| Chairman | 2022 |
| Board of Directors | 2017 |
| Former (24) |
| Deputy Chairman | 1981 – 1996 |
| Board of Directors | 2010 – 2014 |
| Board of Directors | 2017 – 2018 |
| Chairman | 2008 – 2010 |
| Deputy Chairman | 1981 – 1990 |
| Board of Directors | 2003 – 2003 |
| Board of Directors | 2003 – 2003 |
| Board of Directors | 1996 – 1998 |
| Board of Directors | 2003 – 2004 |
| Board of Directors | 1981 – 1994 |
| Board of Directors | 2020 – 2021 |
| Board of Directors | 2002 – 2003 |
| Board of Directors | 2017 – 2017 |
| Board of Directors | 2014 – 2016 |
| Board of Directors | 2005 – 2006 |
| Deputy Chairman | 1981 – 1993 |
| Board of Directors | 2005 – 2009 |
| Chairman | 2017 – 2022 |
| Board of Directors | 2004 – 2010 |
| Deputy Chairman | 2017 – 2020 |
| Chairman | 1981 – 1996 |
| Chairman | 2003 – 2008 |
| Board of Directors | 2018 – 2024 |
| Board of Directors | 1981 – 1994 |