| Current (2) |
| Chairman | 2021 |
| Board of Directors | 2022 |
| Former (15) |
| Board of Directors | 2016 – 2017 |
| Chairman | 2000 – 2008 |
| Board of Directors | 1987 – 1991 |
| Board of Directors | 1987 – 1998 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 2019 – 2021 |
| Board of Directors | 1987 – 1990 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 2013 – 2015 |
| Board of Directors | 2008 – 2013 |
| Board of Directors | 1987 – 1989 |
| Board of Directors | 1987 – 1991 |
| Board of Directors | 2017 – 2019 |
| Chairman | 2013 – 2021 |
| Board of Directors | 2015 – 2016 |