| Current (5) |
| Board of Directors | 2014 |
| Board of Directors | 2026 |
| Board of Directors | 2019 |
| Board of Directors | 2016 |
| Chairman | 2015 |
| Former (12) |
| Chairman | 2014 – 2015 |
| Board of Directors | 1997 – 2009 |
| Board of Directors | 2016 – 2019 |
| Board of Directors | 1986 – 2000 |
| Board of Directors | 1997 – 1997 |
| Board of Directors | 2014 – 2016 |
| Chairman | 2000 – 2003 |
| Board of Directors | 1986 – 2006 |
| Board of Directors | 1986 – 2003 |
| Board of Directors | 2009 – 2014 |
| Chairman | 2003 – 2012 |
| Board of Directors | 2003 – 2016 |