| Former (15) |
| Board of Directors | 1997 – 1997 |
| Board of Directors | 2007 – 2015 |
| Board of Directors | 2003 – 2006 |
| Chairman | 2015 – 2016 |
| Board of Directors | 2018 – 2020 |
| Board of Directors | 1997 – 1999 |
| Board of Directors | 1997 – 1999 |
| Board of Directors | 2005 – 2007 |
| Board of Directors | 2007 – 2011 |
| Chairman | 1997 – 1997 |
| Chairman | 2016 – 2020 |
| Chairman | 1997 – 1997 |
| Board of Directors | 2007 – 2017 |
| Deputy Chairman | 2015 – 2016 |
| Board of Directors | 2008 – 2013 |
