| Current (4) |
| Board of Directors | 2022 |
| Chairman | 2017 |
| Board of Directors | 2023 |
| Board of Directors | 2023 |
| Former (12) |
| Chairman | 2016 – 2017 |
| Chairman | 2010 – 2016 |
| Board of Directors | 1963 – 1996 |
| Board of Directors | 1998 – 2011 |
| Board of Directors | 1963 – 1996 |
| Deputy Chairman | 2016 – 2022 |
| Chairman | 1996 – 2000 |
| Chairman | 2000 – 2009 |
| Board of Directors | 1996 – 2006 |
| Board of Directors | 2012 – 2016 |
| Chairman | 1963 – 1991 |
| Board of Directors | 1996 – 2006 |