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In page Demographics of Western Sahara:

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All demographic data of Western Sahara is widely regarded as being extremely prone to error.[citation needed] It is among the world's most sparsely populated territories and the last official census there was conducted by Spain in 1974. Currently, Western Sahara's political status is disputed between Morocco and the Sahrawi Arab Democratic Republic, which is governed by the Polisario Front. About 80% of Western Sahara is under Moroccan occupation, while the Sahrawi Arab Democratic Republic controls the rest of the territory that lies to the east of the Moroccan-built Berm. The entirety of Western Sahara is classified by the United Nations as a non-self-governing territory that is still awaiting decolonization.