| Board of Directors | 2010 – 2020 |
| Board of Directors | 2008 – 2010 |
| Chairman | 2001 – 2004 |
| Chairman | 2004 – 2008 |
| Board of Directors | 2015 – 2017 |
| Board of Directors | 1979 – 1996 |
| Chairman | 1979 – 2000 |
| Board of Directors | 1979 – 2000 |
| Board of Directors | 1979 – 1989 |
| Board of Directors | 2010 – 2017 |
| Chairman | 2019 – 2020 |
| Board of Directors | 1979 – 2001 |
| Board of Directors | 2017 – 2020 |
| Board of Directors | 1979 – 2000 |
| Board of Directors | 1995 – 1998 |
| Board of Directors | 2005 – 2008 |
| Chairman | 2008 – 2015 |
| Board of Directors | 2000 – 2010 |
| Chairman | 2017 – 2019 |
| Board of Directors | 1979 – 1998 |
| Board of Directors | 2000 – 2001 |
| Board of Directors | 2001 – 2005 |