| Current (3) |
| Board of Directors | 2023 |
| Board of Directors | 2017 |
| Chairman | 2021 |
| Former (25) |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 1970 – 2008 |
| Board of Directors | 2003 – 2015 |
| Board of Directors | 1970 – 1994 |
| Board of Directors | 2008 – 2016 |
| Board of Directors | 1970 – 1996 |
| Board of Directors | 1970 – 1990 |
| Board of Directors | 2019 – 2020 |
| Chairman | 2016 – 2016 |
| Deputy Chairman | 2006 – 2006 |
| Board of Directors | 2002 – 2003 |
| Deputy Chairman | 1999 – 2002 |
| Chairman | 1970 – 2002 |
| Board of Directors | 1970 – 1997 |
| Board of Directors | 1999 – 2003 |
| Chairman | 2003 – 2013 |
| Board of Directors | 1970 – 1993 |
| Deputy Chairman | 2002 – 2006 |
| Board of Directors | 2008 – 2013 |
| Board of Directors | 1970 – 1999 |
| Board of Directors | 1970 – 1999 |
| Board of Directors | 2016 – 2016 |
| Chairman | 2013 – 2013 |
| Chairman | 2013 – 2016 |
| Chairman | 2016 – 2020 |