| Current (2) |
| Chairman | 2019 |
| Board of Directors | 2019 |
| Former (16) |
| Board of Directors | 1999 – 2005 |
| Board of Directors | 1995 – 2004 |
| Board of Directors | 2005 – 2012 |
| Chairman | 2012 – 2015 |
| Board of Directors | 1990 – 1992 |
| Chairman | 2012 – 2012 |
| Board of Directors | 1999 – 2012 |
| Board of Directors | 1990 – 2005 |
| Board of Directors | 2000 – 2012 |
| Board of Directors | 1995 – 1997 |
| Board of Directors | 2004 – 2012 |
| Chairman | 2015 – 2019 |
| Board of Directors | 1996 – 2012 |
| Board of Directors | 1990 – 1994 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 1990 – 1993 |