| Current (2) |
| Chairman | 2022 |
| Board of Directors | 2024 |
| Former (29) |
| Board of Directors | 2012 – 2017 |
| Board of Directors | 2019 – 2024 |
| Board of Directors | 2004 – 2012 |
| Board of Directors | 1961 – 1992 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 1961 – 1993 |
| Board of Directors | 1996 – 1997 |
| Board of Directors | 1997 – 2005 |
| Board of Directors | 1996 – 1997 |
| Board of Directors | 2008 – 2012 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 2006 – 2008 |
| Board of Directors | 2011 – 2015 |
| Board of Directors | 2005 – 2009 |
| Board of Directors | 2009 – 2011 |
| Board of Directors | 2013 – 2015 |
| Board of Directors | 1961 – 1990 |
| Chairman | 2017 – 2019 |
| Board of Directors | 2000 – 2001 |
| Chairman | 1993 – 2015 |
| Board of Directors | 2015 – 2019 |
| Board of Directors | 1961 – 1990 |
| Board of Directors | 1997 – 2004 |
| Board of Directors | 1995 – 1997 |
| Chairman | 2019 – 2022 |
| Board of Directors | 2015 – 2017 |
| Chairman | 2015 – 2017 |
| Board of Directors | 2004 – 2006 |
| Board of Directors | 1995 – 1995 |
