| Current (2) |
| Chairman | 2010 |
| Board of Directors | 2026 |
| Former (13) |
| Board of Directors | 1986 – 1995 |
| Board of Directors | 2007 – 2012 |
| Board of Directors | 2019 – 2020 |
| Chairman | 2000 – 2004 |
| Board of Directors | 1997 – 1999 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 1999 – 2000 |
| Board of Directors | 1986 – 1997 |
| Chairman | 1997 – 2000 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 1986 – 1994 |
| Board of Directors | 2000 – 2005 |
| Board of Directors | 1986 – 1997 |