| Board of Directors | 1972 – 1998 |
| Board of Directors | 1972 – 2005 |
| Board of Directors | 1972 – 1999 |
| Board of Directors | 1998 – 2006 |
| Chairman | 2008 – 2011 |
| Board of Directors | 1998 – 2008 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 1972 – 2008 |
| Board of Directors | 2002 – 2007 |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 1972 – 1998 |
| Board of Directors | 1998 – 2002 |
| Chairman | 2006 – 2008 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 1972 – 2006 |
| Board of Directors | 2002 – 2006 |
| Board of Directors | 2008 – 2010 |