| Current (2) |
| Board of Directors | 2019 |
| Chairman | 2022 |
| Former (13) |
| Board of Directors | 2013 – 2014 |
| Deputy Chairman | 2001 – 2007 |
| Board of Directors | 1970 – 1998 |
| Board of Directors | 2007 – 2013 |
| Board of Directors | 1970 – 2001 |
| Board of Directors | 1970 – 1999 |
| Deputy Chairman | 1999 – 2001 |
| Board of Directors | 1970 – 1990 |
| Chairman | 2019 – 2022 |
| Chairman | 2001 – 2019 |
| Board of Directors | 1970 – 1995 |
| Board of Directors | 1970 – 1998 |
| Board of Directors | 2003 – 2006 |