| Current (2) |
| Board of Directors | 2008 |
| Board of Directors | 2020 |
| Former (17) |
| Board of Directors | 2001 – 2002 |
| Board of Directors | 1983 – 1989 |
| Board of Directors | 2003 – 2007 |
| Chairman | 1997 – 2001 |
| Board of Directors | 2001 – 2004 |
| Chairman | 2017 – 2020 |
| Board of Directors | 1997 – 2001 |
| Board of Directors | 2001 – 2003 |
| Board of Directors | 1997 – 2001 |
| Board of Directors | 1995 – 1997 |
| Chairman | 2003 – 2008 |
| Chairman | 2008 – 2017 |
| Chairman | 1983 – 1997 |
| Board of Directors | 1995 – 1997 |
| Board of Directors | 1983 – 2001 |
| Board of Directors | 2002 – 2004 |
| Chairman | 2001 – 2003 |