From 1917 until 1981 there was only one Senior Division and one Junior Division.
From 1982 until 2011 there were 2 Senior Divisions, becoming 3 Senior Divisions from 2012 to 2014.
From 1982 until 2014 there were 2 Junior Divisions with a Division 3 only for 1 year in 2012.
From 2015 the Senior and Junior Leagues merged, removing the distinction between Senior and Junior Divisions creating five divisions with a straight through promotion and relegation format. Senior 1 became Division 1, Senior 2 became Division 2, Senior 3 became Division 3, Junior 1 became Division 4 and Junior 2 became Division 5.
