| Board of Directors | 2007 – 2012 |
| Board of Directors | 2020 – 2020 |
| Chairman | 2014 – 2020 |
| Board of Directors | 1989 – 2014 |
| Board of Directors | 2014 – 2020 |
| Board of Directors | 2004 – 2007 |
| Board of Directors | 1989 – 1994 |
| Board of Directors | 2004 – 2007 |
| Chairman | 1989 – 2004 |
| Board of Directors | 2012 – 2014 |
| Board of Directors | 2007 – 2007 |
| Board of Directors | 1989 – 2004 |
| Board of Directors | 2014 – 2020 |
| Board of Directors | 2020 – 2020 |
| Board of Directors | 1989 – 1990 |