| Management | 1991 – 1992 |
| Management | 1991 – 1991 |
| Management | 1997 – 2000 |
| Chief Executive Officer | 2006 – 2007 |
| Management | 2008 – 2008 |
| Management | 1991 – 1996 |
| Management | 2009 – 2010 |
| Management | 2010 – 2012 |
| Unofficial title | 2012 – 2014 |
| Management | 2000 – 2003 |
| Management | 2003 – 2006 |
| Management | 2007 – 2008 |
| Management | 2008 – 2009 |
| Management | 2010 – 2010 |
| Management | 1996 – 1997 |
| Management | 2008 – 2009 |
| Management | 2008 – 2008 |
| Management | 2007 – 2008 |
| Management | 2007 – 2008 |
