| Chairman | 1991 – 1996 |
| Board of Directors | 2000 – 2004 |
| Board of Directors | 2007 – 2009 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1991 – 1994 |
| Board of Directors | 2007 – 2010 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 1996 – 2000 |
| Board of Directors | 1996 – 1998 |
| Board of Directors | 2004 – 2005 |
| Board of Directors | 1995 – 1998 |
| Board of Directors | 1991 – 1995 |
| Board of Directors | 1991 – 1996 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 2005 – 2007 |
| Chairman | 1998 – 2001 |
| Board of Directors | 2005 – 2010 |
| Board of Directors | 2009 – 2010 |
| Chairman | 2004 – 2005 |
| Board of Directors | 1998 – 2001 |