| Current (2) |
| Board of Directors | 2013 |
| Chairman | 2013 |
| Former (14) |
| Board of Directors | 1938 – 1988 |
| Board of Directors | 1938 – 1999 |
| Board of Directors | 1938 – 1989 |
| Board of Directors | 1999 – 2013 |
| Board of Directors | 1938 – 1989 |
| Board of Directors | 1997 – 1998 |
| Deputy Chairman | 2003 – 2013 |
| Chairman | 1938 – 2013 |
| Board of Directors | 2003 – 2013 |
| Board of Directors | 2003 – 2013 |
| Chairman | 2013 – 2013 |
| Board of Directors | 1938 – 1999 |
| Board of Directors | 1938 – 1999 |
| Board of Directors | 1938 – 1996 |