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Historically, Paraguay's economy depended on agriculture and livestock. Its principal exports have been beef, maize, sugarcane, soybeans, lumber and cotton. High transportation costs, due primarily to Paraguay's landlocked isolation, have driven up the cost of its exports. The country's major source of income is its 'informal economy' -- primarily contraband, including electronics and agricultural produce, most of which passes through Ciudad del Este to or from Brazil. Stolen cars, firearms and illegal drugs are other goods that pass into or through Paraguay, and the country is a major producer of cannabis. In 2001 Paraguay was 'certified' by the US as cooperating in counternarcotics operations, thus avoiding sanctions, but it remains on the US's list of major drug-producing or transit countries.