| Board of Directors | 1989 – 1993 |
| Board of Directors | 2011 – 2018 |
| Deputy Chairman | 2015 – 2019 |
| Board of Directors | 1989 – 1999 |
| Board of Directors | 2006 – 2010 |
| Board of Directors | 1998 – 2003 |
| Board of Directors | 2014 – 2019 |
| Board of Directors | 1997 – 2011 |
| Board of Directors | 2004 – 2011 |
| Board of Directors | 1989 – 1993 |
| Board of Directors | 1997 – 2006 |
| Board of Directors | 2002 – 2013 |
| Deputy Chairman | 1989 – 2004 |
| Board of Directors | 2010 – 2018 |
| Board of Directors | 2011 – 2019 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 2001 – 2006 |
| Chairman | 1989 – 2015 |
| Board of Directors | 1989 – 1996 |
| Chairman | 2015 – 2019 |
| Board of Directors | 1989 – 2001 |
| Board of Directors | 2014 – 2014 |
| Chairman | 1989 – 1996 |
| Board of Directors | 1989 – 1997 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 2006 – 2010 |