| Chairman | 2005 – 2016 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 2008 – 2013 |
| Board of Directors | 2013 – 2016 |
| Board of Directors | 2005 – 2006 |
| Board of Directors | 1987 – 1988 |
| Board of Directors | 1987 – 1997 |
| Board of Directors | 2002 – 2008 |
| Board of Directors | 1987 – 1994 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 2000 – 2007 |
| Board of Directors | 2005 – 2016 |
| Board of Directors | 1987 – 1990 |
| Board of Directors | 1987 – 2007 |
| Chairman | 1987 – 1990 |
| Chairman | 1987 – 1995 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 1987 – 2000 |
| Chairman | 1995 – 1998 |
| Board of Directors | 1987 – 1988 |
| Board of Directors | 1987 – 1988 |