| Chairman | 1987 – 1994 |
| Board of Directors | 1996 – 2001 |
| Board of Directors | 2006 – 2010 |
| Board of Directors | 2001 – 2009 |
| Board of Directors | 1987 – 1988 |
| Board of Directors | 1987 – 1996 |
| Chairman | 2001 – 2006 |
| Board of Directors | 1987 – 1996 |
| Chairman | 1987 – 1995 |
| Board of Directors | 1995 – 2001 |
| Chairman | 1987 – 1995 |
| Board of Directors | 1987 – 1996 |
| Chairman | 1996 – 2001 |
| Board of Directors | 1987 – 1994 |
| Board of Directors | 1987 – 1996 |
| Chairman | 2006 – 2010 |
| Chairman | 1987 – 1992 |
| Board of Directors | 1987 – 1992 |
| Chairman | 1987 – 1988 |
| Board of Directors | 2001 – 2010 |
| Board of Directors | 2009 – 2010 |
| Board of Directors | 1987 – 1988 |