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In page Economy of Nauru:

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Phosphate is Nauru's only export product, although the government also receives relatively significant foreign exchange income from licensing its rich skipjack tuna fishing grounds to foreign fishing vessels, which land an annual average of 50,000 tonnes of Nauru zone-caught tuna overseas.[1] In 2004 income from phosphate export was US$640,000, with Australia, New Zealand and Japan serving as the country's major export markets. In the same year the Nauru government budget shows that income from licensing foreign fishing vessels was over US$3,000,000.[citation needed]