| Current (3) |
| Board of Directors | 2013 |
| Chairman | 2013 |
| Board of Directors | 2017 |
| Former (15) |
| Chairman | 1992 – 1998 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 1992 – 2000 |
| Chairman | 1992 – 1993 |
| Chairman | 2006 – 2010 |
| Chairman | 1998 – 1999 |
| Board of Directors | 1998 – 2002 |
| Board of Directors | 2011 – 2013 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 2006 – 2006 |
| Chairman | 1999 – 2000 |
| Chairman | 2010 – 2013 |
| Board of Directors | 1998 – 1998 |
| Board of Directors | 2002 – 2008 |
| Board of Directors | 1992 – 1993 |