Bylaws are only amended on odd numbered year conventions so that there is more time to nominate candidates on even years.
The most recent revisions are updated here, on the primary website.
Currently the linked archives only go back to 2007
2021 Bylaws
2019 Bylaws
2017 Bylaws (Regular Convention)
2017 Bylaws (Special Convention)
2015 Bylaws
2013 Bylaws
2011 Bylaws
2007 Bylaws
1989 Bylaws