| Board of Directors | 1975 – 1992 |
| Board of Directors | 1975 – 1992 |
| Board of Directors | 2000 – 2013 |
| Chairman | 1996 – 1997 |
| Board of Directors | 1975 – 1992 |
| Board of Directors | 2008 – 2013 |
| Board of Directors | 1975 – 1992 |
| Board of Directors | 1997 – 2013 |
| Board of Directors | 1975 – 1997 |
| Board of Directors | 1975 – 1997 |
| Board of Directors | 2002 – 2013 |
| Board of Directors | 1975 – 1997 |
| Board of Directors | 1997 – 2013 |
| Chairman | 1997 – 2008 |
| Chairman | 1975 – 1996 |
| Chairman | 2008 – 2013 |