| Current (3) |
| Chairman | 2016 |
| Board of Directors | 2013 |
| Board of Directors | 2015 |
| Former (12) |
| Board of Directors | 2008 – 2010 |
| Chairman | 2005 – 2010 |
| Board of Directors | 1997 – 2005 |
| Board of Directors | 1997 – 2005 |
| Chairman | 1997 – 2005 |
| Board of Directors | 2013 – 2015 |
| Chairman | 2012 – 2016 |
| Board of Directors | 2006 – 2012 |
| Board of Directors | 2012 – 2013 |
| Board of Directors | 2012 – 2013 |
| Board of Directors | 2005 – 2006 |
| Board of Directors | 2006 – 2008 |