| Current (4) |
| Board of Directors | 2015 |
| Board of Directors | 2023 |
| Chairman | 2023 |
| Board of Directors | 2019 |
| Former (14) |
| Chairman | 2005 – 2013 |
| Board of Directors | 2015 – 2019 |
| Chairman | 1984 – 1990 |
| Board of Directors | 1984 – 2000 |
| Chairman | 2018 – 2023 |
| Board of Directors | 2013 – 2019 |
| Board of Directors | 2000 – 2016 |
| Board of Directors | 2001 – 2007 |
| Chairman | 2013 – 2018 |
| Board of Directors | 2003 – 2007 |
| Chairman | 2000 – 2005 |
| Board of Directors | 2000 – 2006 |
| Board of Directors | 1984 – 1990 |
| Board of Directors | 2007 – 2015 |