| Former (23) |
| Board of Directors | 1983 – 1988 |
| Chairman | 2011 – 2012 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 1983 – 1999 |
| Board of Directors | 1983 – 1993 |
| Board of Directors | 2011 – 2012 |
| Board of Directors | 1983 – 2008 |
| Board of Directors | 2008 – 2009 |
| Board of Directors | 1983 – 1995 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 2009 – 2012 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 1983 – 1992 |
| Chairman | 2009 – 2011 |
| Chairman | 2004 – 2009 |
| Board of Directors | 1995 – 1996 |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 1983 – 1988 |
| Board of Directors | 1983 – 1988 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 1983 – 1989 |
| Board of Directors | 1983 – 1998 |
