| Current (2) |
| Board of Directors | 2023 |
| Chairman | 2023 |
| Former (14) |
| Board of Directors | 1999 – 2010 |
| Board of Directors | 1980 – 2000 |
| Board of Directors | 1980 – 1999 |
| Board of Directors | 2003 – 2006 |
| Board of Directors | 2014 – 2017 |
| Board of Directors | 2018 – 2023 |
| Board of Directors | 2010 – 2017 |
| Board of Directors | 2003 – 2006 |
| Chairman | 2017 – 2018 |
| Board of Directors | 2006 – 2014 |
| Board of Directors | 1998 – 2000 |
| Chairman | 2018 – 2023 |
| Board of Directors | 1980 – 2004 |
| Board of Directors | 2003 – 2003 |