| Current (3) |
| Board of Directors | 2024 |
| Board of Directors | 2022 |
| Chairman | 2022 |
| Former (18) |
| Board of Directors | 2003 – 2008 |
| Board of Directors | 2009 – 2014 |
| Board of Directors | 2008 – 2009 |
| Board of Directors | 2002 – 2019 |
| Board of Directors | 1961 – 1992 |
| Board of Directors | 1961 – 1996 |
| Chairman | 1997 – 1999 |
| Chairman | 1961 – 1997 |
| Board of Directors | 2014 – 2016 |
| Board of Directors | 2022 – 2024 |
| Board of Directors | 2016 – 2022 |
| Board of Directors | 1961 – 1996 |
| Board of Directors | 1961 – 2002 |
| Board of Directors | 1961 – 1992 |
| Board of Directors | 2000 – 2003 |
| Chairman | 1999 – 2000 |
| Board of Directors | 2014 – 2022 |
| Chairman | 2019 – 2022 |