| Board of Directors | 1998 – 2000 |
| Board of Directors | 2000 – 2004 |
| Board of Directors | 1988 – 1996 |
| Board of Directors | 1988 – 1989 |
| Board of Directors | 2002 – 2004 |
| Chairman | 2004 – 2009 |
| Board of Directors | 1996 – 1998 |
| Board of Directors | 2004 – 2013 |
| Chairman | 2009 – 2011 |
| Chairman | 2011 – 2014 |
| Board of Directors | 1996 – 1997 |
| Chairman | 1998 – 2004 |
| Board of Directors | 2009 – 2014 |
| Board of Directors | 2004 – 2009 |
| Board of Directors | 1997 – 2002 |
| Chairman | 1997 – 1998 |
| Chairman | 1988 – 1989 |
| Board of Directors | 2013 – 2014 |
| Board of Directors | 1988 – 1989 |