| Board of Directors | 1999 – 2007 |
| Board of Directors | 2000 – 2003 |
| Board of Directors | 1957 – 1996 |
| Board of Directors | 2013 – 2014 |
| Board of Directors | 1957 – 1990 |
| Board of Directors | 2013 – 2015 |
| Board of Directors | 1957 – 1990 |
| Board of Directors | 2013 – 2014 |
| Chairman | 1957 – 2006 |
| Board of Directors | 2010 – 2013 |
| Board of Directors | 2010 – 2013 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 1996 – 2013 |
| Board of Directors | 2013 – 2014 |
| Board of Directors | 2007 – 2010 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 1957 – 1990 |
| Board of Directors | 1998 – 1999 |
| Chairman | 2006 – 2015 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 1957 – 1990 |
| Deputy Chairman | 1998 – 1999 |
| Board of Directors | 1957 – 1990 |
| Board of Directors | 2010 – 2013 |
| Board of Directors | 1957 – 1998 |
| Board of Directors | 2000 – 2003 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 1957 – 1988 |