| Former (22) |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 2014 – 2016 |
| Board of Directors | 2006 – 2007 |
| Board of Directors | 2010 – 2014 |
| Chairman | 2015 – 2017 |
| Chairman | 2013 – 2014 |
| Deputy Chairman | 2019 – 2020 |
| Board of Directors | 2006 – 2014 |
| Board of Directors | 2015 – 2017 |
| Board of Directors | 2006 – 2010 |
| Board of Directors | 1988 – 1991 |
| Chairman | 2006 – 2013 |
| Deputy Chairman | 2006 – 2010 |
| Board of Directors | 1988 – 1999 |
| Chairman | 2019 – 2020 |
| Deputy Chairman | 2010 – 2015 |
| Board of Directors | 2015 – 2017 |
| Chairman | 1988 – 1991 |
| Deputy Chairman | 2015 – 2019 |
| Chairman | 2017 – 2019 |
| Board of Directors | 1988 – 2001 |
| Board of Directors | 2010 – 2016 |