| Former (17) |
| Board of Directors | 1983 – 1988 |
| Board of Directors | 1983 – 2001 |
| Board of Directors | 1983 – 2001 |
| Board of Directors | 1983 – 2000 |
| Chairman | 2013 – 2018 |
| Chairman | 2018 – 2019 |
| Board of Directors | 1983 – 1989 |
| Board of Directors | 2001 – 2012 |
| Chairman | 2001 – 2012 |
| Board of Directors | 2000 – 2001 |
| Chairman | 2000 – 2001 |
| Board of Directors | 1983 – 2001 |
| Board of Directors | 1983 – 2000 |
| Board of Directors | 1983 – 2001 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 1983 – 1990 |