| Current (2) |
| Chairman | 2022 |
| Board of Directors | 2021 |
| Former (18) |
| Board of Directors | 1997 – 1999 |
| Deputy Chairman | 2013 – 2017 |
| Chairman | 2022 – 2022 |
| Board of Directors | 1997 – 1997 |
| Chairman | 2004 – 2014 |
| Chairman | 2019 – 2020 |
| Board of Directors | 2007 – 2010 |
| Chairman | 2014 – 2015 |
| Board of Directors | 1999 – 2004 |
| Board of Directors | 1997 – 1997 |
| Board of Directors | 2011 – 2013 |
| Chairman | 2015 – 2019 |
| Chairman | 2020 – 2022 |
| Chairman | 1997 – 2002 |
| Board of Directors | 2010 – 2011 |
| Board of Directors | 2020 – 2021 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 2007 – 2011 |