| Chairman | 2013 – 2013 |
| Board of Directors | 1990 – 1994 |
| Board of Directors | 2009 – 2020 |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 1999 – 2002 |
| Board of Directors | 2020 – 2020 |
| Chairman | 1995 – 1996 |
| Board of Directors | 1990 – 1995 |
| Board of Directors | 1990 – 1995 |
| Board of Directors | 1990 – 2013 |
| Board of Directors | 1990 – 1993 |
| Board of Directors | 2002 – 2004 |
| Chairman | 2013 – 2014 |
| Board of Directors | 2004 – 2010 |
| Board of Directors | 2019 – 2020 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 2020 – 2022 |
| Board of Directors | 2002 – 2004 |
| Board of Directors | 1996 – 1999 |
| Chairman | 2020 – 2023 |
| Board of Directors | 2022 – 2023 |
| Board of Directors | 2022 – 2023 |
| Chairman | 2014 – 2020 |
| Board of Directors | 2010 – 2015 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 1990 – 2009 |
| Board of Directors | 1990 – 1991 |
| Board of Directors | 2020 – 2022 |
| Board of Directors | 2010 – 2013 |
| Board of Directors | 2008 – 2010 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 1990 – 1991 |
| Board of Directors | 2015 – 2018 |