| Former (14) |
| Board of Directors | 2019 – 2020 |
| Board of Directors | 2006 – 2009 |
| Board of Directors | 1991 – 2008 |
| Chairman | 2008 – 2021 |
| Deputy Chairman | 1991 – 2013 |
| Board of Directors | 2002 – 2007 |
| Board of Directors | 1991 – 2001 |
| Board of Directors | 2001 – 2004 |
| Board of Directors | 1991 – 1995 |
| Board of Directors | 2007 – 2018 |
| Board of Directors | 2009 – 2017 |
| Board of Directors | 2005 – 2006 |
| Chairman | 1991 – 2008 |
| Board of Directors | 1991 – 2009 |
