| Board of Directors | 1991 – 1994 |
| Board of Directors | 1991 – 2008 |
| Chairman | 1991 – 2006 |
| Board of Directors | 1991 – 1996 |
| Chairman | 2000 – 2019 |
| Board of Directors | 1991 – 1999 |
| Board of Directors | 1991 – 2003 |
| Board of Directors | 2011 – 2014 |
| Board of Directors | 2008 – 2019 |
| Board of Directors | 2014 – 2019 |
| Board of Directors | 2006 – 2011 |
| Board of Directors | 1991 – 2000 |
| Deputy Chairman | 2015 – 2019 |
| Board of Directors | 1991 – 2004 |
| Deputy Chairman | 2011 – 2013 |
| Board of Directors | 2006 – 2019 |
| Board of Directors | 2004 – 2006 |
| Deputy Chairman | 2003 – 2011 |