| Current (3) |
| Board of Directors | 2015 |
| Chairman | 2020 |
| Board of Directors | 2022 |
| Former (14) |
| Board of Directors | 2003 – 2015 |
| Board of Directors | 2003 – 2004 |
| Board of Directors | 2004 – 2005 |
| Board of Directors | 2007 – 2010 |
| Board of Directors | 1984 – 2003 |
| Board of Directors | 2005 – 2007 |
| Board of Directors | 1984 – 1991 |
| Board of Directors | 1984 – 1993 |
| Board of Directors | 1984 – 2011 |
| Board of Directors | 1984 – 1989 |
| Board of Directors | 2010 – 2021 |
| Board of Directors | 1984 – 2001 |
| Board of Directors | 2001 – 2003 |
| Chairman | 2015 – 2020 |