| Current (3) |
| Chairman | 2012 |
| Board of Directors | 2023 |
| Board of Directors | 2017 |
| Former (20) |
| Board of Directors | 1997 – 2002 |
| Deputy Chairman | 1970 – 1989 |
| Deputy Chairman | 2012 – 2014 |
| Board of Directors | 1970 – 2002 |
| Deputy Chairman | 1970 – 2004 |
| Deputy Chairman | 2014 – 2020 |
| Board of Directors | 2006 – 2014 |
| Deputy Chairman | 1970 – 1993 |
| Board of Directors | 2013 – 2021 |
| Board of Directors | 2017 – 2021 |
| Board of Directors | 2012 – 2017 |
| Board of Directors | 2019 – 2020 |
| Chairman | 1970 – 1999 |
| Board of Directors | 2019 – 2020 |
| Board of Directors | 1970 – 1996 |
| Board of Directors | 1999 – 2014 |
| Chairman | 2006 – 2011 |
| Board of Directors | 2005 – 2007 |
| Board of Directors | 2007 – 2013 |
| Chairman | 1999 – 2006 |