| Former (18) |
| Board of Directors | 1980 – 1993 |
| Board of Directors | 2020 – 2022 |
| Board of Directors | 2015 – 2020 |
| Board of Directors | 1980 – 1996 |
| Board of Directors | 2012 – 2015 |
| Board of Directors | 1999 – 2002 |
| Board of Directors | 2008 – 2015 |
| Board of Directors | 1999 – 2008 |
| Board of Directors | 1998 – 1999 |
| Chairman | 2015 – 2022 |
| Board of Directors | 1999 – 1999 |
| Board of Directors | 1980 – 1993 |
| Chairman | 2009 – 2015 |
| Board of Directors | 2015 – 2019 |
| Board of Directors | 2015 – 2015 |
| Board of Directors | 1996 – 1998 |
| Chairman | 1997 – 1999 |
| Board of Directors | 2019 – 2022 |