| Chairman | 2007 – 2010 |
| Board of Directors | 2009 – 2010 |
| Chairman | 2010 – 2012 |
| Board of Directors | 1997 – 2003 |
| Board of Directors | 2001 – 2006 |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 1984 – 1993 |
| Board of Directors | 2009 – 2010 |
| Chairman | 2002 – 2007 |
| Board of Directors | 2010 – 2012 |
| Board of Directors | 1984 – 1997 |
| Board of Directors | 2011 – 2012 |
| Board of Directors | 2010 – 2011 |
| Board of Directors | 2007 – 2010 |