| Current (2) |
| Board of Directors | 2023 |
| Chairman | 2023 |
| Former (15) |
| Board of Directors | 2013 – 2015 |
| Board of Directors | 2010 – 2012 |
| Board of Directors | 1997 – 2000 |
| Chairman | 2001 – 2020 |
| Board of Directors | 2013 – 2014 |
| Board of Directors | 2003 – 2009 |
| Board of Directors | 1964 – 2000 |
| Board of Directors | 1964 – 1992 |
| Chairman | 2021 – 2023 |
| Board of Directors | 2012 – 2016 |
| Board of Directors | 1964 – 1992 |
| Board of Directors | 2016 – 2018 |
| Board of Directors | 2000 – 2003 |
| Board of Directors | 2018 – 2020 |
| Board of Directors | 2001 – 2010 |