| Board of Directors | 1987 – 1993 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1987 – 1988 |
| Board of Directors | 1987 – 1993 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 2008 – 2012 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 2011 – 2011 |
| Board of Directors | 1998 – 2008 |
| Board of Directors | 1987 – 1989 |
| Board of Directors | 2011 – 2014 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1987 – 1988 |
| Chairman | 2011 – 2017 |
| Board of Directors | 1995 – 1998 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 1987 – 1995 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 1995 – 1995 |
| Board of Directors | 1999 – 2004 |
| Chairman | 2007 – 2011 |
| Board of Directors | 2012 – 2013 |
| Board of Directors | 1987 – 1999 |
| Board of Directors | 1987 – 1993 |
| Board of Directors | 1998 – 2004 |
| Chairman | 1987 – 1988 |
| Board of Directors | 2013 – 2025 |