| Current (2) |
| Chairman | 2011 |
| Board of Directors | 2025 |
| Former (18) |
| Board of Directors | 1989 – 1996 |
| Chairman | 2002 – 2004 |
| Board of Directors | 1989 – 1989 |
| Board of Directors | 2004 – 2006 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 2000 – 2004 |
| Chairman | 1996 – 1998 |
| Chairman | 2006 – 2011 |
| Chairman | 2004 – 2006 |
| Chairman | 2000 – 2002 |
| Board of Directors | 2006 – 2025 |
| Chairman | 1989 – 1994 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 1989 – 1996 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 2000 – 2004 |
| Chairman | 1989 – 1989 |
| Board of Directors | 1989 – 1993 |