| Board of Directors | 1987 – 1990 |
| Board of Directors | 1987 – 1987 |
| Board of Directors | 1987 – 1992 |
| Board of Directors | 2012 – 2019 |
| Board of Directors | 2002 – 2010 |
| Board of Directors | 2002 – 2005 |
| Board of Directors | 2006 – 2018 |
| Board of Directors | 1987 – 1993 |
| Board of Directors | 1996 – 2005 |
| Chairman | 2002 – 2017 |
| Board of Directors | 1987 – 2005 |
| Chairman | 1987 – 1992 |
| Chairman | 1987 – 1987 |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 2010 – 2012 |
| Board of Directors | 1987 – 1996 |
| Board of Directors | 1987 – 1987 |
| Chairman | 2017 – 2019 |