| Current (2) |
| Chairman | 2023 |
| Board of Directors | 2026 |
| Former (19) |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 1980 – 1988 |
| Board of Directors | 1980 – 2000 |
| Chairman | 2017 – 2023 |
| Chairman | 2000 – 2005 |
| Board of Directors | 1980 – 2000 |
| Board of Directors | 1980 – 1992 |
| Board of Directors | 1980 – 1998 |
| Board of Directors | 2005 – 2006 |
| Board of Directors | 2019 – 2026 |
| Chairman | 2017 – 2017 |
| Chairman | 2006 – 2009 |
| Chairman | 2009 – 2017 |
| Board of Directors | 1980 – 1993 |
| Board of Directors | 2006 – 2006 |
| Board of Directors | 2009 – 2011 |
| Board of Directors | 2011 – 2012 |
| Board of Directors | 2017 – 2019 |
| Board of Directors | 2012 – 2017 |