It is not necessary in my system to have a threshold, because we have a
gift for the winning party.
The government party has a higher percentage of députés than percentage of votes, and we give to the other parties—like the opposition party and a third party—ratios that are under 1%, whereas the government party has an actual ratio over 1%, at 1.2% or 1.3%.
The historical ratio for an opposition party is about 0.8%, whereas the same ratio for the third party is about 0.5%, so it's half. If a party has 20% of the votes, multiplied by 0.5%, it gives them 10% of the députés. If they have only 3% of the députés , we give the party 7% more députés. Do you understand?
Therefore there is no need for a threshold, because the majority of the government and the importance of the official opposition party will never be certain.