| Current (2) |
| Chairman | 2020 |
| Deputy Chairman | 2022 |
| Former (28) |
| Board of Directors | 1998 – 2004 |
| Board of Directors | 1998 – 2005 |
| Board of Directors | 2009 – 2014 |
| Deputy Chairman | 2000 – 2003 |
| Board of Directors | 1991 – 1998 |
| Board of Directors | 2000 – 2004 |
| Board of Directors | 2014 – 2020 |
| Chairman | 2016 – 2020 |
| Board of Directors | 1991 – 2000 |
| Board of Directors | 1991 – 1998 |
| Chairman | 2009 – 2016 |
| Board of Directors | 1991 – 1993 |
| Deputy Chairman | 2016 – 2017 |
| Deputy Chairman | 2003 – 2004 |
| Board of Directors | 2011 – 2020 |
| Board of Directors | 2003 – 2017 |
| Board of Directors | 2016 – 2020 |
| Chairman | 1993 – 2000 |
| Deputy Chairman | 2017 – 2020 |
| Board of Directors | 1991 – 1998 |
| Board of Directors | 1991 – 2001 |
| Deputy Chairman | 2009 – 2017 |
| Board of Directors | 1991 – 1994 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 2016 – 2020 |
| Board of Directors | 1994 – 1998 |
| Board of Directors | 2011 – 2017 |
| Chairman | 1998 – 2009 |