| Former (22) |
| Board of Directors | 2015 – 2018 |
| Board of Directors | 2010 – 2012 |
| Board of Directors | 2004 – 2008 |
| Board of Directors | 2012 – 2015 |
| Chairman | 2012 – 2015 |
| Chairman | 2017 – 2018 |
| Board of Directors | 2015 – 2017 |
| Chairman | 2004 – 2008 |
| Chairman | 2018 – 2020 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 2018 – 2020 |
| Board of Directors | 2006 – 2008 |
| Chairman | 2015 – 2017 |
| Board of Directors | 2006 – 2008 |
| Chairman | 2008 – 2012 |
| Board of Directors | 2020 – 2020 |
| Chairman | 2015 – 2015 |
| Chairman | 2003 – 2004 |
| Board of Directors | 2012 – 2015 |
| Chairman | 2020 – 2020 |
| Board of Directors | 2008 – 2012 |
| Board of Directors | 1998 – 2001 |