| Former (15) |
| Board of Directors | 1998 – 1999 |
| Board of Directors | 2013 – 2017 |
| Board of Directors | 1998 – 1999 |
| Chairman | 2017 – 2017 |
| Board of Directors | 1963 – 1995 |
| Board of Directors | 1963 – 1995 |
| Chairman | 2006 – 2007 |
| Board of Directors | 1999 – 2001 |
| Board of Directors | 2012 – 2014 |
| Chairman | 2016 – 2017 |
| Board of Directors | 2007 – 2011 |
| Board of Directors | 2001 – 2005 |
| Chairman | 2009 – 2010 |
| Chairman | 1963 – 1998 |
| Board of Directors | 2017 – 2017 |