| Current (4) |
| Chairman | 2004 |
| Board of Directors | 2007 |
| Board of Directors | 2007 |
| Board of Directors | 2007 |
| Former (19) |
| Board of Directors | 1984 – 1995 |
| Board of Directors | 1984 – 1993 |
| Chairman | 1999 – 2000 |
| Board of Directors | 1984 – 1995 |
| Board of Directors | 2003 – 2004 |
| Board of Directors | 2000 – 2003 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 1998 – 2003 |
| Board of Directors | 1984 – 2000 |
| Board of Directors | 1984 – 1996 |
| Board of Directors | 1984 – 1995 |
| Chairman | 2000 – 2002 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 1984 – 1992 |
| Board of Directors | 1984 – 1992 |
| Chairman | 2002 – 2004 |
| Chairman | 1984 – 1998 |
| Board of Directors | 1984 – 1999 |
| Board of Directors | 2003 – 2007 |