| Current (4) |
| Board of Directors | 2022 |
| Chairman | 2007 |
| Board of Directors | 2023 |
| Board of Directors | 1999 |
| Former (18) |
| Board of Directors | 2007 – 2017 |
| Board of Directors | 1953 – 2006 |
| Chairman | 2005 – 2006 |
| Board of Directors | 1953 – 1989 |
| Board of Directors | 1953 – 2002 |
| Board of Directors | 2012 – 2015 |
| Chairman | 1953 – 1995 |
| Board of Directors | 2007 – 2011 |
| Board of Directors | 2007 – 2012 |
| Board of Directors | 2003 – 2003 |
| Board of Directors | 1999 – 1999 |
| Board of Directors | 2020 – 2022 |
| Board of Directors | 2019 – 2020 |
| Board of Directors | 1995 – 2023 |
| Chairman | 2003 – 2005 |
| Chairman | 1995 – 1998 |
| Chairman | 2006 – 2007 |
| Board of Directors | 2015 – 2019 |