| Current (2) |
| Chairman | 2019 |
| Board of Directors | 2023 |
| Former (17) |
| Board of Directors | 2011 – 2014 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1983 – 1996 |
| Chairman | 2007 – 2012 |
| Board of Directors | 2013 – 2023 |
| Chairman | 2012 – 2019 |
| Board of Directors | 2010 – 2016 |
| Board of Directors | 2007 – 2011 |
| Deputy Chairman | 1983 – 1994 |
| Chairman | 2000 – 2007 |
| Board of Directors | 1983 – 2000 |
| Board of Directors | 2007 – 2010 |
| Board of Directors | 2000 – 2004 |
| Deputy Chairman | 1983 – 2004 |
| Board of Directors | 1983 – 1994 |
| Chairman | 1983 – 2000 |
| Board of Directors | 2004 – 2007 |
