| Chairman | 2014 – 2017 |
| Board of Directors | 2005 – 2007 |
| Chairman | 2003 – 2007 |
| Board of Directors | 1996 – 2012 |
| Chairman | 1989 – 2000 |
| Deputy Chairman | 1998 – 2001 |
| Board of Directors | 2019 – 2020 |
| Chairman | 2013 – 2014 |
| Board of Directors | 1989 – 2000 |
| Board of Directors | 1989 – 1996 |
| Board of Directors | 2017 – 2019 |
| Board of Directors | 2002 – 2003 |
| Deputy Chairman | 1989 – 1992 |
| Deputy Chairman | 1989 – 1998 |
| Board of Directors | 2013 – 2017 |
| Board of Directors | 2014 – 2014 |
| Deputy Chairman | 1989 – 1998 |
| Chairman | 2018 – 2020 |
| Chairman | 2009 – 2012 |
| Chairman | 1989 – 1992 |
| Board of Directors | 2000 – 2020 |
| Board of Directors | 1999 – 2008 |
| Deputy Chairman | 2003 – 2004 |
| Chairman | 2007 – 2009 |
| Board of Directors | 1989 – 2000 |
| Board of Directors | 2012 – 2020 |
| Chairman | 2012 – 2013 |
| Chairman | 2017 – 2018 |
| Deputy Chairman | 2004 – 2005 |
| Board of Directors | 2017 – 2020 |
| Board of Directors | 2014 – 2019 |
| Board of Directors | 2010 – 2013 |
| Board of Directors | 2013 – 2016 |
| Board of Directors | 1989 – 1999 |
| Deputy Chairman | 1989 – 1996 |
| Deputy Chairman | 2001 – 2003 |
| Board of Directors | 2008 – 2014 |
| Board of Directors | 2010 – 2013 |
| Chairman | 2000 – 2003 |
| Board of Directors | 2008 – 2010 |