| Chairman | 1987 – 1999 |
| Board of Directors | 1987 – 1987 |
| Board of Directors | 1987 – 1991 |
| Board of Directors | 1987 – 1990 |
| Board of Directors | 1987 – 2007 |
| Board of Directors | 1987 – 1990 |
| Board of Directors | 2007 – 2012 |
| Board of Directors | 1987 – 1990 |
| Chairman | 1999 – 2012 |
| Board of Directors | 1987 – 1991 |
| Board of Directors | 2008 – 2012 |
| Board of Directors | 2009 – 2012 |
| Board of Directors | 2008 – 2012 |
| Board of Directors | 1987 – 2012 |
| Board of Directors | 1987 – 1991 |
| Board of Directors | 1987 – 1987 |
| Board of Directors | 1987 – 1987 |