| Chairman | 1998 – 2000 |
| Board of Directors | 2005 – 2007 |
| Chairman | 2000 – 2010 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 2010 – 2016 |
| Board of Directors | 2002 – 2012 |
| Board of Directors | 1977 – 1998 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 2012 – 2016 |
| Chairman | 1977 – 1996 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 2012 – 2016 |
| Board of Directors | 2012 – 2016 |
| Board of Directors | 2005 – 2016 |
| Board of Directors | 1998 – 1999 |
| Board of Directors | 1977 – 1998 |