| Former (19) |
| Board of Directors | 2008 – 2010 |
| Chairman | 2012 – 2016 |
| Board of Directors | 2012 – 2012 |
| Board of Directors | 2003 – 2005 |
| Chairman | 2003 – 2009 |
| Board of Directors | 2007 – 2010 |
| Board of Directors | 2016 – 2018 |
| Board of Directors | 1987 – 2003 |
| Board of Directors | 1987 – 1999 |
| Board of Directors | 2015 – 2016 |
| Chairman | 2003 – 2003 |
| Board of Directors | 1987 – 1997 |
| Board of Directors | 2003 – 2003 |
| Board of Directors | 1987 – 2003 |
| Board of Directors | 2010 – 2012 |
| Chairman | 2016 – 2018 |
| Board of Directors | 1987 – 1994 |
| Board of Directors | 2003 – 2005 |
| Board of Directors | 1987 – 1994 |
