| Current (1) |
| Chairman | 2017 |
| Former (16) |
| Chairman | 2004 – 2006 |
| Board of Directors | 1990 – 1991 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 1990 – 1992 |
| Board of Directors | 1990 – 1999 |
| Board of Directors | 1990 – 1995 |
| Chairman | 1990 – 1999 |
| Chairman | 1990 – 1991 |
| Chairman | 2006 – 2014 |
| Board of Directors | 1990 – 1994 |
| Chairman | 2014 – 2016 |
| Board of Directors | 2004 – 2016 |
| Board of Directors | 2022 – 2024 |
| Board of Directors | 2016 – 2017 |
| Chairman | 1990 – 2001 |
| Chairman | 2016 – 2017 |