| Current (2) |
| Board of Directors | 2023 |
| Chairman | 2017 |
| Former (18) |
| Chairman | 2002 – 2003 |
| Board of Directors | 1988 – 1988 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 2003 – 2004 |
| Chairman | 2006 – 2017 |
| Board of Directors | 2023 – 2023 |
| Board of Directors | 1988 – 1994 |
| Board of Directors | 1988 – 1989 |
| Board of Directors | 2002 – 2003 |
| Chairman | 1988 – 2002 |
| Board of Directors | 1988 – 1996 |
| Board of Directors | 1999 – 2003 |
| Chairman | 2003 – 2004 |
| Board of Directors | 2017 – 2018 |
| Board of Directors | 2018 – 2023 |
| Board of Directors | 1988 – 1993 |
| Chairman | 1988 – 1988 |
| Board of Directors | 1988 – 2002 |