| Former (19) |
| Chairman | 2013 – 2016 |
| Board of Directors | 2005 – 2008 |
| Board of Directors | 1997 – 2001 |
| Board of Directors | 2010 – 2014 |
| Chairman | 2007 – 2010 |
| Board of Directors | 2008 – 2010 |
| Board of Directors | 1987 – 1989 |
| Board of Directors | 1987 – 1996 |
| Chairman | 2010 – 2013 |
| Board of Directors | 1987 – 1996 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 2010 – 2016 |
| Board of Directors | 2016 – 2016 |
| Board of Directors | 1987 – 1996 |
| Board of Directors | 1987 – 1989 |
| Board of Directors | 1996 – 1997 |
| Chairman | 1996 – 2001 |
| Chairman | 2001 – 2004 |
| Board of Directors | 1996 – 2001 |
