| Board of Directors | 1987 – 1990 |
| Board of Directors | 2009 – 2010 |
| Chairman | 2008 – 2019 |
| Board of Directors | 1987 – 2006 |
| Board of Directors | 2004 – 2006 |
| Board of Directors | 2011 – 2019 |
| Board of Directors | 1987 – 1996 |
| Board of Directors | 1987 – 2013 |
| Board of Directors | 2008 – 2009 |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 2000 – 2002 |
| Board of Directors | 2008 – 2019 |
| Board of Directors | 2006 – 2011 |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 1987 – 1990 |