| Chairman | 2019 – 2021 |
| Board of Directors | 1999 – 1999 |
| Board of Directors | 2001 – 2003 |
| Board of Directors | 1986 – 1991 |
| Board of Directors | 1986 – 1996 |
| Board of Directors | 2001 – 2006 |
| Board of Directors | 1986 – 1992 |
| Chairman | 2018 – 2019 |
| Board of Directors | 2006 – 2016 |
| Board of Directors | 1986 – 1998 |
| Board of Directors | 1999 – 2001 |
| Chairman | 2012 – 2018 |
| Board of Directors | 1986 – 1989 |
| Board of Directors | 1986 – 1995 |
| Board of Directors | 1986 – 1992 |
| Board of Directors | 2019 – 2019 |
| Chairman | 1986 – 1989 |
| Board of Directors | 1986 – 1991 |
| Board of Directors | 1986 – 1988 |
| Board of Directors | 2014 – 2018 |
| Board of Directors | 2012 – 2015 |
| Chairman | 2001 – 2012 |
| Board of Directors | 1986 – 1991 |
| Board of Directors | 1986 – 1999 |
| Board of Directors | 2016 – 2018 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 1986 – 1991 |
| Chairman | 1999 – 2001 |
| Board of Directors | 1986 – 1999 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 1986 – 1989 |
| Board of Directors | 2019 – 2021 |