| Current (2) |
| Board of Directors | 2023 |
| Chairman | 2022 |
| Former (15) |
| Chairman | 1991 – 1991 |
| Board of Directors | 2001 – 2007 |
| Chairman | 2008 – 2009 |
| Board of Directors | 2007 – 2008 |
| Chairman | 2012 – 2020 |
| Board of Directors | 2003 – 2007 |
| Chairman | 2008 – 2012 |
| Board of Directors | 1991 – 2001 |
| Board of Directors | 2020 – 2023 |
| Board of Directors | 2007 – 2008 |
| Chairman | 1991 – 2001 |
| Board of Directors | 2009 – 2011 |
| Board of Directors | 1991 – 1993 |
| Board of Directors | 1991 – 1991 |
| Chairman | 2020 – 2022 |