| Former (20) |
| Board of Directors | 1972 – 2001 |
| Board of Directors | 1972 – 1997 |
| Board of Directors | 1972 – 1994 |
| Board of Directors | 2000 – 2003 |
| Deputy Chairman | 2009 – 2009 |
| Board of Directors | 2007 – 2008 |
| Board of Directors | 1972 – 2004 |
| Chairman | 2008 – 2009 |
| Board of Directors | 2007 – 2009 |
| Board of Directors | 1972 – 1991 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1972 – 1988 |
| Deputy Chairman | 2001 – 2003 |
| Board of Directors | 2007 – 2009 |
| Deputy Chairman | 1972 – 1992 |
| Board of Directors | 1998 – 2000 |
| Deputy Chairman | 2008 – 2009 |
| Board of Directors | 2009 – 2009 |
| Board of Directors | 1997 – 2001 |
| Chairman | 2001 – 2003 |