| Current (3) |
| Deputy Chairman | 2019 |
| Board of Directors | 2022 |
| Chairman | 2021 |
| Former (23) |
| Board of Directors | 1997 – 2001 |
| Board of Directors | 2014 – 2022 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 2008 – 2014 |
| Board of Directors | 2008 – 2019 |
| Board of Directors | 2003 – 2007 |
| Deputy Chairman | 2016 – 2019 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 2014 – 2019 |
| Chairman | 1981 – 1997 |
| Board of Directors | 1999 – 2007 |
| Deputy Chairman | 2008 – 2016 |
| Board of Directors | 1981 – 1997 |
| Chairman | 2008 – 2021 |
| Board of Directors | 2007 – 2022 |
| Board of Directors | 1981 – 1999 |
| Board of Directors | 1981 – 1999 |
| Board of Directors | 2005 – 2008 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 1981 – 1994 |
| Board of Directors | 2007 – 2012 |
| Board of Directors | 1997 – 2008 |
| Board of Directors | 1981 – 1997 |