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In page Economy of Mongolia:

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The rapid political changes of 1990–91 marked the beginning of Mongolia's efforts to develop a market economy, but these efforts have been complicated and disrupted by the dissolution and continuing deterioration of the economy of the former Soviet Union. Prior to 1991, 80% of Mongolia's trade was with the former Soviet Union, and 15% was with other Council for Mutual Economic Assistance (CMEA) countries. Mongolia was heavily dependent upon the former Soviet Union for fuel, medicine, and spare parts for its factories and power plants.[citation needed]