| Board of Directors | 1997 – 1999 |
| Board of Directors | 2001 – 2009 |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 1981 – 1993 |
| Board of Directors | 2005 – 2006 |
| Board of Directors | 1981 – 1991 |
| Board of Directors | 1981 – 1993 |
| Board of Directors | 1981 – 2005 |
| Board of Directors | 1997 – 2001 |
| Board of Directors | 2005 – 2009 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 1981 – 1997 |
| Board of Directors | 1981 – 1997 |
| Board of Directors | 1981 – 1991 |