| Current (2) |
| Board of Directors | 1996 |
| Chairman | 2015 |
| Former (15) |
| Board of Directors | 1996 – 2007 |
| Board of Directors | 2007 – 2013 |
| Board of Directors | 1996 – 1997 |
| Chairman | 2009 – 2015 |
| Board of Directors | 2005 – 2013 |
| Chairman | 2015 – 2015 |
| Board of Directors | 1982 – 1994 |
| Board of Directors | 1992 – 1994 |
| Board of Directors | 1982 – 1990 |
| Board of Directors | 1982 – 1992 |
| Board of Directors | 1996 – 1997 |
| Board of Directors | 1992 – 1992 |
| Chairman | 1982 – 1992 |
| Board of Directors | 1982 – 2003 |
| Board of Directors | 1992 – 1995 |