| Chairman | 2017 – 2020 |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 1973 – 1992 |
| Board of Directors | 1973 – 1996 |
| Chairman | 2021 – 2022 |
| Board of Directors | 2005 – 2008 |
| Board of Directors | 1973 – 1994 |
| Board of Directors | 2009 – 2010 |
| Board of Directors | 2009 – 2010 |
| Board of Directors | 1973 – 2005 |
| Chairman | 2011 – 2011 |
| Board of Directors | 1973 – 2003 |
| Chairman | 2020 – 2021 |
| Board of Directors | 2008 – 2010 |
| Board of Directors | 1973 – 2009 |
| Board of Directors | 2017 – 2017 |
| Board of Directors | 2008 – 2020 |
| Chairman | 2014 – 2017 |
| Board of Directors | 2011 – 2011 |
| Board of Directors | 2003 – 2006 |
| Board of Directors | 1973 – 2008 |
| Board of Directors | 2003 – 2008 |
| Board of Directors | 2020 – 2022 |
| Board of Directors | 1973 – 1992 |
| Board of Directors | 1973 – 2003 |
| Chairman | 2020 – 2020 |
| Board of Directors | 2011 – 2018 |
| Board of Directors | 2001 – 2009 |
| Board of Directors | 2003 – 2008 |
| Board of Directors | 2018 – 2020 |