| Former (19) |
| Chairman | 2012 – 2016 |
| Board of Directors | 2012 – 2016 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1971 – 1988 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 2007 – 2012 |
| Board of Directors | 1971 – 1988 |
| Board of Directors | 2009 – 2012 |
| Board of Directors | 1971 – 1990 |
| Chairman | 2007 – 2008 |
| Board of Directors | 1971 – 2002 |
| Board of Directors | 2002 – 2007 |
| Board of Directors | 1971 – 1988 |
| Chairman | 1971 – 2002 |
| Chairman | 2004 – 2007 |
| Board of Directors | 1971 – 2002 |
| Board of Directors | 1971 – 1988 |
| Board of Directors | 2007 – 2009 |
| Chairman | 2008 – 2012 |