| Former (25) |
| Board of Directors | 1982 – 1995 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 1982 – 1991 |
| Board of Directors | 1982 – 1997 |
| Board of Directors | 1982 – 1992 |
| Board of Directors | 2002 – 2003 |
| Chairman | 2016 – 2018 |
| Chairman | 2007 – 2009 |
| Chairman | 2004 – 2007 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 1982 – 1995 |
| Chairman | 2009 – 2013 |
| Board of Directors | 1982 – 1993 |
| Chairman | 2001 – 2004 |
| Board of Directors | 1982 – 1997 |
| Board of Directors | 1997 – 2018 |
| Board of Directors | 2003 – 2008 |
| Board of Directors | 2018 – 2018 |
| Board of Directors | 1999 – 1999 |
| Board of Directors | 1997 – 1999 |
| Board of Directors | 2014 – 2018 |
| Board of Directors | 1982 – 1992 |
| Board of Directors | 1982 – 1989 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 1982 – 1996 |