Number of tiers
Iceland
Answer
2
Source
Article 31: […] For each respective electoral district, six seats shall be allocated in accordance with the outcome of elections within that district. The number of parliamentary seats for each electoral district shall in other respects be defined by law, subject however to the provisions of the fifth paragraph.
Seats other than those allocated to the electoral districts shall be distributed within each respective electoral district with the purpose of providing individual political parties with representation reflecting to the fullest possible extent each party’s total number of votes. However, only political parties having received at least five per cent of all valid votes cast nation-wide shall be eligible for such distribution.