| Board of Directors | 2000 – 2014 |
| Deputy Chairman | 1991 – 1992 |
| Board of Directors | 2003 – 2010 |
| Board of Directors | 1991 – 1997 |
| Board of Directors | 2007 – 2018 |
| Board of Directors | 1991 – 1997 |
| Board of Directors | 2010 – 2018 |
| Board of Directors | 2010 – 2015 |
| Board of Directors | 2012 – 2018 |
| Board of Directors | 2010 – 2014 |
| Board of Directors | 2001 – 2009 |
| Chairman | 1991 – 1997 |
| Board of Directors | 2016 – 2018 |
| Board of Directors | 1991 – 1994 |
| Board of Directors | 2002 – 2014 |
| Board of Directors | 1991 – 1992 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1991 – 1995 |
| Board of Directors | 1997 – 2003 |
| Board of Directors | 2009 – 2014 |
| Board of Directors | 1991 – 2001 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 2003 – 2004 |
| Board of Directors | 1991 – 1999 |
| Board of Directors | 2002 – 2003 |
| Board of Directors | 2012 – 2018 |
| Board of Directors | 1991 – 2002 |
| Board of Directors | 2014 – 2018 |
| Board of Directors | 2007 – 2010 |
| Board of Directors | 1999 – 2004 |
| Board of Directors | 2009 – 2018 |
| Board of Directors | 2007 – 2009 |
| Board of Directors | 1991 – 1995 |
| Board of Directors | 1991 – 1993 |
| Board of Directors | 2007 – 2010 |
| Board of Directors | 2003 – 2004 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1991 – 1994 |
| Chairman | 2002 – 2007 |
| Board of Directors | 1991 – 2003 |
| Chairman | 1997 – 2002 |
| Board of Directors | 1991 – 1997 |
| Board of Directors | 1991 – 2016 |
| Board of Directors | 2004 – 2007 |