| Current (2) |
| Board of Directors | 1995 |
| Chairman | 2023 |
| Former (14) |
| Chairman | 1999 – 2001 |
| Board of Directors | 1989 – 1990 |
| Chairman | 1989 – 1995 |
| Board of Directors | 1989 – 2015 |
| Chairman | 2009 – 2014 |
| Board of Directors | 1989 – 1994 |
| Board of Directors | 2002 – 2003 |
| Board of Directors | 2015 – 2022 |
| Chairman | 2022 – 2023 |
| Board of Directors | 1989 – 1995 |
| Board of Directors | 1995 – 2010 |
| Chairman | 2022 – 2022 |
| Chairman | 1989 – 1990 |
| Board of Directors | 2007 – 2014 |