| Current (3) |
| Chairman | 2025 |
| Board of Directors | 2014 |
| Board of Directors | 2012 |
| Former (23) |
| Chairman | 1996 – 2003 |
| Board of Directors | 1985 – 1995 |
| Chairman | 2017 – 2025 |
| Board of Directors | 1985 – 2002 |
| Chairman | 2003 – 2009 |
| Chairman | 1995 – 1996 |
| Board of Directors | 1985 – 1996 |
| Board of Directors | 2003 – 2005 |
| Board of Directors | 2005 – 2010 |
| Chairman | 2009 – 2014 |
| Board of Directors | 2002 – 2003 |
| Board of Directors | 2002 – 2002 |
| Board of Directors | 1997 – 2008 |
| Board of Directors | 1985 – 1991 |
| Chairman | 2014 – 2015 |
| Board of Directors | 2010 – 2012 |
| Board of Directors | 1985 – 1997 |
| Board of Directors | 1985 – 1991 |
| Board of Directors | 2009 – 2014 |
| Chairman | 2015 – 2017 |
| Board of Directors | 2003 – 2009 |
| Board of Directors | 1985 – 1997 |
| Board of Directors | 2002 – 2008 |