All 19 member nations are among the top 31 economies as measured in GDP at nominal prices in a list published by the International Monetary Fund (IMF) for 2020. Not represented by membership in the G20 are UN member states, Switzerland (ranked 18th by the IMF), Iran (22), Thailand (25) and Nigeria (27) even though they rank higher than some members. Taiwan (21), which is not a UN-member state is also not represented. The Netherlands (17), Sweden (24), Poland (23), Belgium (26), Austria (28) and Ireland (29) are included only as part of the EU, and not independently. Spain (13) is a permanent guest invitee.