| Former (18) |
| Chairman | 2000 – 2006 |
| Board of Directors | 1969 – 1989 |
| Board of Directors | 1969 – 1995 |
| Chairman | 2013 – 2013 |
| Board of Directors | 2013 – 2014 |
| Chairman | 2017 – 2018 |
| Chairman | 2006 – 2008 |
| Board of Directors | 1969 – 1989 |
| Chairman | 2013 – 2014 |
| Board of Directors | 2009 – 2012 |
| Chairman | 2014 – 2017 |
| Chairman | 2008 – 2013 |
| Board of Directors | 1969 – 1989 |
| Board of Directors | 2003 – 2006 |
| Board of Directors | 1995 – 2000 |
| Chairman | 2018 – 2023 |
| Board of Directors | 2014 – 2023 |
| Board of Directors | 2000 – 2003 |