| Current (3) |
| Chairman | 2011 |
| Board of Directors | 2022 |
| Board of Directors | 2012 |
| Former (20) |
| Chairman | 2004 – 2007 |
| Chairman | 2008 – 2011 |
| Chairman | 1987 – 1994 |
| Chairman | 1987 – 2001 |
| Deputy Chairman | 1987 – 1991 |
| Board of Directors | 1987 – 2001 |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 1987 – 1988 |
| Chairman | 2008 – 2008 |
| Deputy Chairman | 1987 – 1994 |
| Chairman | 2001 – 2004 |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 2001 – 2006 |
| Board of Directors | 2007 – 2011 |
| Board of Directors | 2012 – 2022 |
| Board of Directors | 1987 – 2001 |
| Board of Directors | 2006 – 2007 |
| Chairman | 1987 – 1988 |
| Chairman | 1987 – 1991 |
| Board of Directors | 2002 – 2004 |