 The league reached its maximum size in the 2001, 2004 and 2007 seasons, in which 19 teams competed in each instance.The league was then primarily contracting from 2011 to 2018, either dropping teams proving to be financially unfeasible or having teams depart because of concerns about the financial structure or travel distances.In 2019, the league had its first season in which all teams returned from the previous season, where the league had tied a record low of four active members.