In both France and the Netherlands, between one-fifth and one-third of voters support extremist parties that oppose European integration, globalisation or both.

ECONOMIST: Charlemagne

And I believe that he should -- that there should be a ruling that his remarks are not germane, and frankly, that if he proceeds, he will be denying the president and any other parties the constitutional right of due process in the Fifth Amendment.

CNN: Transcript: Judiciary Committee impeachment hearing

Some 45% of those who said they intended to vote for Golden Dawn this time around had backed one of the two mainstream parties, PASOK and New Democracy, in 2009, while a fifth had backed LAOS, Gemenis said.

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Moreover, Muslim and Croat parties, almost all of whose supporters are in exile, probably also took at least a fifth of the vote.

ECONOMIST: Bosnia��s Serbs

They did so by filling a fifth of parliament's seats through proportional representation and by including other rules to shrink the number of parties.

ECONOMIST: Thailand

Mr Djukanovic's Democratic Socialists have a fair chance of forming a majority coalition with smaller parties, including the Liberals and those representing ethnic Albanians and Muslims, who together are a fifth of the population.

ECONOMIST: Yugoslavia