| Board of Directors | 2012 – 2013 |
| Board of Directors | 1989 – 2005 |
| Chairman | 1989 – 2001 |
| Board of Directors | 1989 – 1997 |
| Board of Directors | 2016 – 2019 |
| Board of Directors | 2012 – 2016 |
| Deputy Chairman | 1989 – 2011 |
| Board of Directors | 2019 – 2019 |
| Board of Directors | 1989 – 2004 |
| Board of Directors | 2005 – 2005 |
| Chairman | 2002 – 2005 |
| Deputy Chairman | 2020 – 2021 |
| Board of Directors | 2011 – 2012 |
| Board of Directors | 2020 – 2021 |
| Board of Directors | 2019 – 2020 |
| Deputy Chairman | 2012 – 2013 |
| Board of Directors | 2009 – 2012 |
| Deputy Chairman | 2011 – 2012 |
| Chairman | 2009 – 2012 |
| Chairman | 2005 – 2009 |
| Board of Directors | 2016 – 2018 |
| Board of Directors | 2005 – 2012 |
| Board of Directors | 2007 – 2012 |
| Chairman | 2016 – 2019 |
| Board of Directors | 2005 – 2012 |
| Board of Directors | 2012 – 2019 |
| Deputy Chairman | 2016 – 2019 |
| Board of Directors | 1989 – 2007 |
| Board of Directors | 2020 – 2020 |
| Chairman | 1989 – 1992 |
| Chairman | 2019 – 2021 |