| Board of Directors | 2006 – 2012 |
| Chairman | 2016 – 2021 |
| Board of Directors | 2013 – 2022 |
| Board of Directors | 2017 – 2019 |
| Board of Directors | 2020 – 2022 |
| Board of Directors | 2012 – 2013 |
| Chairman | 2021 – 2022 |
| Chairman | 2014 – 2016 |
| Board of Directors | 1985 – 1999 |
| Board of Directors | 1985 – 1992 |
| Board of Directors | 1985 – 2006 |
| Board of Directors | 2007 – 2011 |
| Board of Directors | 2000 – 2007 |
| Board of Directors | 2000 – 2006 |
| Chairman | 2013 – 2014 |
| Board of Directors | 1995 – 1999 |
| Board of Directors | 1985 – 1992 |
| Board of Directors | 1999 – 2011 |
| Board of Directors | 2016 – 2022 |
| Board of Directors | 2021 – 2022 |
| Board of Directors | 2013 – 2013 |
| Board of Directors | 2013 – 2016 |
| Board of Directors | 2016 – 2016 |
| Board of Directors | 2018 – 2020 |
| Board of Directors | 1985 – 1995 |
| Board of Directors | 1997 – 2013 |
| Board of Directors | 2002 – 2006 |
| Board of Directors | 1985 – 1991 |
| Board of Directors | 1985 – 1992 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 2006 – 2012 |
| Board of Directors | 1985 – 1991 |
| Board of Directors | 2012 – 2016 |
| Board of Directors | 2020 – 2022 |