RANKED: The most authoritarian regimes in the world

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Riot police and protesters clash outside the British Embassy in Tehran, Iran, in November 2011.

The Economist Intelligence Unit has released its latest Democracy Index this week, which ranks 167 countries according to political and civic freedom.

Countries are given a score out of 10 based on five criteria. Above eight is a "full democracy," while below four is an "authoritarian regime."

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The study has five criteria: Whether elections are free and fair ("electoral process and pluralism"), whether governments have checks and balances ("functioning of government"), whether citizens are included in politics ("political participation"), the level of support for the government ("political culture"), and whether people have freedom of expression ("civil liberties").

Below are the world's most authoritarian regimes: