| Current (3) |
| Board of Directors | 2022 |
| Chairman | 2015 |
| Board of Directors | 2022 |
| Former (12) |
| Board of Directors | 1989 – 1992 |
| Board of Directors | 1989 – 1997 |
| Board of Directors | 1989 – 1993 |
| Chairman | 2002 – 2002 |
| Board of Directors | 1993 – 1996 |
| Board of Directors | 1989 – 1994 |
| Chairman | 1999 – 2002 |
| Board of Directors | 1999 – 2002 |
| Board of Directors | 1999 – 2002 |
| Chairman | 2002 – 2005 |
| Chairman | 2009 – 2015 |
| Chairman | 2005 – 2009 |