| Deputy Chairman | 2010 – 2015 |
| Deputy Chairman | 2009 – 2010 |
| Chairman | 1999 – 2001 |
| Board of Directors | 1998 – 2001 |
| Chairman | 1980 – 2009 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 1980 – 1997 |
| Chairman | 1995 – 1999 |
| Board of Directors | 1980 – 1997 |
| Chairman | 2004 – 2006 |
| Board of Directors | 2005 – 2009 |
| Chairman | 2001 – 2002 |
| Board of Directors | 2003 – 2017 |
| Board of Directors | 1980 – 1989 |
| Board of Directors | 1994 – 1995 |
| Board of Directors | 2004 – 2005 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 2009 – 2013 |
| Board of Directors | 1980 – 1989 |
| Board of Directors | 1980 – 1995 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 1980 – 2004 |
| Chairman | 2009 – 2010 |
| Board of Directors | 1980 – 1994 |
| Board of Directors | 1980 – 1998 |
| Board of Directors | 2009 – 2013 |
| Deputy Chairman | 2015 – 2017 |
| Board of Directors | 2005 – 2006 |
| Chairman | 2010 – 2017 |
| Board of Directors | 1998 – 1998 |
| Board of Directors | 2001 – 2004 |