| Former (18) |
| Board of Directors | 1983 – 2005 |
| Deputy Chairman | 2011 – 2013 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 2002 – 2013 |
| Deputy Chairman | 2006 – 2010 |
| Chairman | 2006 – 2011 |
| Chairman | 2011 – 2013 |
| Board of Directors | 1983 – 2002 |
| Board of Directors | 2007 – 2013 |
| Chairman | 1983 – 1992 |
| Board of Directors | 1998 – 2003 |
| Board of Directors | 1983 – 1991 |
| Board of Directors | 1983 – 1999 |
| Board of Directors | 2003 – 2010 |
| Board of Directors | 2004 – 2013 |
| Board of Directors | 1996 – 1997 |
| Board of Directors | 1983 – 2004 |
| Board of Directors | 1996 – 2004 |