| Board of Directors | 1989 – 1989 |
| Board of Directors | 1993 – 1996 |
| Board of Directors | 2006 – 2013 |
| Deputy Chairman | 1989 – 2000 |
| Board of Directors | 1989 – 1993 |
| Board of Directors | 1989 – 2017 |
| Board of Directors | 1989 – 1989 |
| Board of Directors | 1989 – 1989 |
| Board of Directors | 2013 – 2017 |
| Board of Directors | 1989 – 1998 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 1989 – 1991 |
| Chairman | 2001 – 2017 |
| Chairman | 1989 – 2001 |
| Board of Directors | 1989 – 2004 |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 2001 – 2017 |