| Board of Directors | 2011 – 2016 |
| Board of Directors | 2001 – 2011 |
| Chairman | 2016 – 2017 |
| Board of Directors | 1989 – 1989 |
| Chairman | 2018 – 2018 |
| Board of Directors | 1999 – 2016 |
| Board of Directors | 1989 – 1992 |
| Board of Directors | 1989 – 1999 |
| Deputy Chairman | 2018 – 2018 |
| Chairman | 1999 – 2001 |
| Board of Directors | 2016 – 2018 |
| Chairman | 2001 – 2016 |
| Board of Directors | 1989 – 1990 |
| Chairman | 1989 – 1989 |
| Board of Directors | 1989 – 1989 |
| Board of Directors | 1989 – 1999 |