| Former (18) |
| Chairman | 2018 – 2018 |
| Board of Directors | 2007 – 2008 |
| Board of Directors | 1988 – 1988 |
| Board of Directors | 2007 – 2012 |
| Board of Directors | 2008 – 2014 |
| Board of Directors | 1988 – 1999 |
| Board of Directors | 2003 – 2007 |
| Chairman | 1999 – 2007 |
| Board of Directors | 1988 – 2007 |
| Board of Directors | 2018 – 2019 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 2014 – 2015 |
| Chairman | 2017 – 2018 |
| Chairman | 2011 – 2017 |
| Chairman | 2007 – 2011 |
| Chairman | 1988 – 1988 |
| Chairman | 2018 – 2019 |
| Board of Directors | 1988 – 2007 |
