| Former (17) |
| Board of Directors | 1989 – 1994 |
| Board of Directors | 2016 – 2020 |
| Board of Directors | 2012 – 2016 |
| Chairman | 2017 – 2020 |
| Board of Directors | 2016 – 2020 |
| Chairman | 1989 – 2007 |
| Chairman | 2016 – 2017 |
| Board of Directors | 2007 – 2012 |
| Deputy Chairman | 1989 – 2007 |
| Board of Directors | 1989 – 2012 |
| Chairman | 2013 – 2016 |
| Chairman | 2013 – 2013 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 1989 – 1993 |
| Deputy Chairman | 1989 – 2012 |
| Chairman | 2012 – 2013 |
| Board of Directors | 1989 – 1993 |