| Current (2) |
| Chairman | 2020 |
| Board of Directors | 2022 |
| Former (17) |
| Chairman | 2010 – 2015 |
| Chairman | 2015 – 2015 |
| Board of Directors | 2013 – 2013 |
| Board of Directors | 2000 – 2003 |
| Chairman | 1992 – 1992 |
| Board of Directors | 2014 – 2014 |
| Board of Directors | 1992 – 2001 |
| Chairman | 2004 – 2010 |
| Board of Directors | 2004 – 2008 |
| Chairman | 2010 – 2010 |
| Board of Directors | 2014 – 2015 |
| Board of Directors | 2019 – 2022 |
| Board of Directors | 1992 – 2004 |
| Chairman | 2015 – 2020 |
| Board of Directors | 2011 – 2012 |
| Board of Directors | 1992 – 1992 |
| Board of Directors | 1992 – 2004 |