| Chairman | 1955 – 1993 |
| Deputy Chairman | 2006 – 2008 |
| Board of Directors | 1999 – 2002 |
| Board of Directors | 1955 – 1991 |
| Board of Directors | 1999 – 2009 |
| Chairman | 1955 – 1998 |
| Chairman | 1998 – 2012 |
| Deputy Chairman | 2012 – 2015 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 2014 – 2015 |
| Deputy Chairman | 2008 – 2011 |
| Deputy Chairman | 2011 – 2012 |
| Board of Directors | 1955 – 2007 |
| Chairman | 2012 – 2015 |
| Board of Directors | 1955 – 1999 |