| Former (18) |
| Board of Directors | 1988 – 1996 |
| Deputy Chairman | 2005 – 2006 |
| Chairman | 2015 – 2025 |
| Board of Directors | 2025 – 2025 |
| Board of Directors | 2009 – 2010 |
| Board of Directors | 2005 – 2006 |
| Deputy Chairman | 1988 – 2005 |
| Board of Directors | 1988 – 1995 |
| Deputy Chairman | 1996 – 1998 |
| Chairman | 2008 – 2009 |
| Chairman | 1998 – 2006 |
| Board of Directors | 2018 – 2024 |
| Board of Directors | 2010 – 2015 |
| Board of Directors | 2015 – 2015 |
| Chairman | 2009 – 2015 |
| Board of Directors | 1988 – 1998 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 1988 – 1989 |