| Former (24) |
| Chairman | 1996 – 2020 |
| Board of Directors | 1985 – 1995 |
| Board of Directors | 1985 – 2002 |
| Board of Directors | 2003 – 2007 |
| Chairman | 1985 – 2002 |
| Board of Directors | 2003 – 2010 |
| Chairman | 1985 – 1995 |
| Board of Directors | 2011 – 2014 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 2002 – 2003 |
| Board of Directors | 1998 – 2008 |
| Board of Directors | 2002 – 2007 |
| Board of Directors | 1985 – 1996 |
| Board of Directors | 2010 – 2020 |
| Board of Directors | 2007 – 2009 |
| Board of Directors | 2002 – 2002 |
| Board of Directors | 2007 – 2011 |
| Board of Directors | 2002 – 2002 |
| Board of Directors | 1985 – 1995 |
| Board of Directors | 2002 – 2007 |
| Board of Directors | 2011 – 2015 |
| Board of Directors | 1985 – 1996 |
| Board of Directors | 2002 – 2002 |
| Board of Directors | 1996 – 1998 |