| Current (3) |
| Chairman | 2018 |
| Board of Directors | 2018 |
| Board of Directors | 2014 |
| Former (14) |
| Board of Directors | 2000 – 2000 |
| Board of Directors | 1990 – 1995 |
| Board of Directors | 1990 – 2000 |
| Board of Directors | 1990 – 1994 |
| Chairman | 2015 – 2018 |
| Board of Directors | 1990 – 1994 |
| Board of Directors | 1990 – 1994 |
| Board of Directors | 2001 – 2002 |
| Chairman | 2006 – 2015 |
| Board of Directors | 2010 – 2018 |
| Board of Directors | 1990 – 2000 |
| Board of Directors | 1990 – 2014 |
| Board of Directors | 2002 – 2010 |
| Board of Directors | 2000 – 2006 |
