| Current (3) |
| Board of Directors | 2018 |
| Chairman | 2016 |
| Board of Directors | 2023 |
| Former (20) |
| Board of Directors | 1999 – 2007 |
| Board of Directors | 2008 – 2011 |
| Board of Directors | 2003 – 2018 |
| Board of Directors | 1983 – 1999 |
| Board of Directors | 1983 – 1998 |
| Board of Directors | 2007 – 2014 |
| Board of Directors | 2007 – 2008 |
| Chairman | 1983 – 1999 |
| Board of Directors | 1983 – 1992 |
| Board of Directors | 1983 – 1989 |
| Board of Directors | 1999 – 2003 |
| Board of Directors | 1983 – 1999 |
| Board of Directors | 2014 – 2018 |
| Chairman | 2008 – 2016 |
| Board of Directors | 2007 – 2008 |
| Chairman | 1999 – 2007 |
| Board of Directors | 1998 – 1999 |
| Board of Directors | 1983 – 2003 |
| Board of Directors | 2008 – 2008 |
| Board of Directors | 2003 – 2007 |