| Current (2) |
| Chairman | 2019 |
| Board of Directors | 2023 |
| Former (27) |
| Board of Directors | 1986 – 1992 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 2007 – 2013 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 1986 – 1993 |
| Board of Directors | 1986 – 1995 |
| Board of Directors | 1986 – 1993 |
| Chairman | 2018 – 2019 |
| Board of Directors | 1986 – 1988 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 2006 – 2007 |
| Chairman | 2015 – 2018 |
| Board of Directors | 1986 – 1998 |
| Board of Directors | 1998 – 1999 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 1986 – 1999 |
| Board of Directors | 2002 – 2013 |
| Board of Directors | 2003 – 2006 |
| Chairman | 2013 – 2015 |
| Board of Directors | 1998 – 1998 |
| Board of Directors | 1986 – 1991 |
| Chairman | 1986 – 1997 |
| Board of Directors | 2002 – 2018 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 1986 – 1991 |
| Board of Directors | 1986 – 1993 |
| Board of Directors | 1986 – 1988 |