| Former (22) |
| Board of Directors | 1988 – 2000 |
| Chairman | 2007 – 2010 |
| Chairman | 1999 – 2000 |
| Board of Directors | 1988 – 1988 |
| Board of Directors | 1988 – 1988 |
| Chairman | 1995 – 1999 |
| Chairman | 1988 – 2002 |
| Board of Directors | 1988 – 1993 |
| Board of Directors | 1996 – 2000 |
| Board of Directors | 2002 – 2010 |
| Board of Directors | 1988 – 2002 |
| Chairman | 1993 – 1995 |
| Board of Directors | 2007 – 2012 |
| Board of Directors | 1988 – 1996 |
| Board of Directors | 2010 – 2012 |
| Board of Directors | 1988 – 2002 |
| Board of Directors | 1993 – 2000 |
| Chairman | 1988 – 1993 |
| Chairman | 2003 – 2007 |
| Chairman | 1988 – 1988 |
| Chairman | 2002 – 2003 |
| Chairman | 2010 – 2014 |