New Zealand Unitary Parliamentary Constitutional Monarchy No
United Kingdom Unitary Parliamentary Constitutional Monarchy No
Sweden Unitary Parliamentary Representative Monarchy No
Iceland Unitary Parliamentary Constitutional Republic No
Norway Unitary Parliamentary Constitutional Monarchy No
Denmark Unitary Parliamentary Constitutional Monarchy No
Finland Parliamentary Republic No
Japan Unitary Parliamentary Democracy No
Canada Federal Parliamentary Democracy No
Australia Federal Parliamentary Constitutional Monarchy No
Italy Unitary Parliamentary Constitutional Republic No
Portugal Unitary Semi-Presidential Constitutional Republic No Yes
Greece Unitary Parliamentary Constitutional Republic No
Spain Unitary Parliamentary Constitutional Monarchy No
South Korea Unitary Presidential Constitutional Republic No
Taiwan Unitary Semi-Presidential Constitutional Republic No
Israel Unitary Semi-Presidential Constitutional Republic No
Austria Federal Parliamentary Republic No
Belgium Federal Parliamentary Constitutional Monarchy No
France Unitary Semi-Presidential Constitutional Republic No
Germany Federal Parliamentary Constitutional Republic No
Luxembourg Unitary Parliamentary Constitutional Monarchy No
Netherlands Unitary Parliamentary Representative Monarchy No
Switzerland Directorial Federal Republic No