| Chairman | 2009 – 2019 |
| Board of Directors | 2016 – 2017 |
| Board of Directors | 1998 – 2000 |
| Board of Directors | 2009 – 2019 |
| Board of Directors | 2017 – 2019 |
| Board of Directors | 2000 – 2007 |
| Chairman | 1991 – 2000 |
| Board of Directors | 2002 – 2009 |
| Board of Directors | 1998 – 2008 |
| Board of Directors | 1991 – 1998 |
| Board of Directors | 1991 – 2000 |
| Board of Directors | 1998 – 2001 |
| Board of Directors | 2001 – 2001 |
| Chairman | 2000 – 2008 |
| Board of Directors | 2001 – 2003 |
| Board of Directors | 1991 – 1996 |
| Board of Directors | 2019 – 2019 |
| Board of Directors | 2009 – 2019 |
| Board of Directors | 2008 – 2009 |
| Chairman | 1991 – 1996 |
| Board of Directors | 1991 – 2008 |
| Board of Directors | 1991 – 1998 |
| Board of Directors | 2001 – 2003 |