| Board of Directors | 1975 – 1988 |
| Board of Directors | 1975 – 1988 |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 2007 – 2013 |
| Board of Directors | 1975 – 2002 |
| Board of Directors | 1975 – 1995 |
| Board of Directors | 2005 – 2013 |
| Board of Directors | 2004 – 2005 |
| Board of Directors | 2002 – 2005 |
| Chairman | 2000 – 2004 |
| Board of Directors | 1999 – 2002 |
| Board of Directors | 1975 – 1992 |
| Board of Directors | 1975 – 1994 |
| Board of Directors | 1995 – 1996 |
| Board of Directors | 1995 – 1997 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 2000 – 2000 |
| Board of Directors | 1975 – 1990 |
| Board of Directors | 1975 – 1997 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1975 – 1997 |
| Chairman | 2005 – 2013 |
| Board of Directors | 1975 – 1996 |
| Chairman | 1998 – 2000 |
| Board of Directors | 1997 – 1999 |
| Chairman | 1975 – 1996 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 1975 – 1988 |
| Board of Directors | 1975 – 1993 |
| Chairman | 2004 – 2005 |
| Board of Directors | 1975 – 1995 |
| Board of Directors | 1997 – 2004 |
| Board of Directors | 2004 – 2004 |
| Board of Directors | 1975 – 1991 |