| Current (2) |
| Chairman | 2019 |
| Board of Directors | 2019 |
| Former (14) |
| Chairman | 1997 – 2000 |
| Board of Directors | 2014 – 2016 |
| Board of Directors | 1993 – 1993 |
| Board of Directors | 1993 – 1997 |
| Board of Directors | 1995 – 1997 |
| Chairman | 2000 – 2001 |
| Chairman | 2014 – 2019 |
| Board of Directors | 1993 – 1995 |
| Board of Directors | 1993 – 1994 |
| Board of Directors | 2001 – 2014 |
| Board of Directors | 1993 – 1997 |
| Board of Directors | 1995 – 1997 |
| Board of Directors | 1993 – 1997 |
| Board of Directors | 1997 – 2000 |