Croatian kuna
As of 2021, three currencies participate in ERM II: the Danish krone, the Croatian kuna and the Bulgarian lev. The currencies of Sweden (the Swedish krona), the three largest countries which joined the European Union on 1 May 2004 (the Polish złoty, the Czech koruna, and the Hungarian forint), and Romania which joined on 1 January 2007 (the Romanian leu), are required to join in accordance with the terms of the applicable treaties of accession.