| Board of Directors | 2010 – 2015 |
| Deputy Chairman | 2014 – 2015 |
| Board of Directors | 1991 – 1991 |
| Board of Directors | 2001 – 2008 |
| Chairman | 1997 – 2005 |
| Board of Directors | 1991 – 1991 |
| Deputy Chairman | 2011 – 2014 |
| Chairman | 2005 – 2010 |
| Board of Directors | 1991 – 1991 |
| Deputy Chairman | 2010 – 2011 |
| Deputy Chairman | 2001 – 2010 |
| Chairman | 2010 – 2013 |
| Deputy Chairman | 1997 – 2001 |
| Board of Directors | 2016 – 2022 |
| Chairman | 2016 – 2022 |
| Board of Directors | 2016 – 2022 |
| Deputy Chairman | 2015 – 2016 |
| Board of Directors | 2005 – 2007 |
| Chairman | 2013 – 2016 |
| Board of Directors | 1991 – 1993 |