| Current (2) |
| Board of Directors | 2022 |
| Chairman | 2022 |
| Former (20) |
| Board of Directors | 2002 – 2003 |
| Chairman | 2021 – 2022 |
| Board of Directors | 1988 – 1999 |
| Board of Directors | 1988 – 1989 |
| Board of Directors | 1988 – 2000 |
| Chairman | 1988 – 1997 |
| Chairman | 1988 – 1994 |
| Board of Directors | 1988 – 1992 |
| Board of Directors | 1988 – 1994 |
| Board of Directors | 1988 – 2000 |
| Chairman | 1997 – 2003 |
| Board of Directors | 1988 – 1995 |
| Chairman | 1988 – 1990 |
| Board of Directors | 1988 – 1990 |
| Board of Directors | 1988 – 1997 |
| Chairman | 2003 – 2008 |
| Chairman | 2008 – 2021 |
| Board of Directors | 2021 – 2022 |
| Chairman | 1988 – 1989 |
| Board of Directors | 2004 – 2008 |