| Former (15) |
| Deputy Chairman | 1988 – 2003 |
| Board of Directors | 1988 – 1990 |
| Chairman | 1988 – 2008 |
| Chairman | 2008 – 2010 |
| Chairman | 1988 – 1995 |
| Board of Directors | 1988 – 1995 |
| Board of Directors | 2011 – 2013 |
| Chairman | 1988 – 1994 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 1988 – 1992 |
| Board of Directors | 1988 – 1995 |
| Deputy Chairman | 1988 – 1994 |
| Chairman | 2011 – 2013 |
| Board of Directors | 1988 – 1992 |
| Board of Directors | 1997 – 2007 |