| Current (2) |
| Chairman | 2023 |
| Board of Directors | 2023 |
| Former (18) |
| Board of Directors | 2015 – 2023 |
| Chairman | 2010 – 2015 |
| Board of Directors | 2003 – 2003 |
| Board of Directors | 1982 – 1988 |
| Board of Directors | 1982 – 1992 |
| Chairman | 2007 – 2010 |
| Board of Directors | 2003 – 2007 |
| Board of Directors | 1982 – 2000 |
| Board of Directors | 1982 – 1990 |
| Chairman | 2019 – 2023 |
| Board of Directors | 1982 – 1992 |
| Board of Directors | 1982 – 1995 |
| Board of Directors | 1982 – 1995 |
| Chairman | 2015 – 2015 |
| Board of Directors | 2010 – 2015 |
| Chairman | 2015 – 2016 |
| Board of Directors | 1997 – 2000 |
| Board of Directors | 1982 – 1995 |