| Former (22) |
| Board of Directors | 1988 – 1994 |
| Chairman | 1997 – 1999 |
| Chairman | 1988 – 1991 |
| Board of Directors | 1988 – 1996 |
| Chairman | 2010 – 2011 |
| Board of Directors | 1988 – 1991 |
| Board of Directors | 1988 – 1990 |
| Board of Directors | 1988 – 1999 |
| Chairman | 1988 – 1997 |
| Board of Directors | 1988 – 2011 |
| Board of Directors | 2022 – 2024 |
| Chairman | 2021 – 2024 |
| Chairman | 2008 – 2010 |
| Chairman | 2001 – 2005 |
| Board of Directors | 2018 – 2022 |
| Board of Directors | 2011 – 2018 |
| Chairman | 2016 – 2021 |
| Chairman | 2012 – 2016 |
| Chairman | 1997 – 2001 |
| Chairman | 2005 – 2008 |
| Chairman | 2011 – 2012 |
| Board of Directors | 1988 – 1990 |