South Ossetia's economy is primarily agricultural, although less than 10% of South Ossetia's land area is cultivated. Cereals, fruit and vines are the major produce. Forestry and cattle industries are also maintained. A number of industrial facilities also exist, particularly around the capital, Tskhinvali. Following the war in the 1990s, South Ossetia struggled economically. South Ossetian GDP was estimated at US$15 million (US$250 per capita) in a work published in 2002. Employment and supplies are scarce. Additionally, Georgia cut off supplies of electricity to the region, which forced the South Ossetian government to run an electric cable through North Ossetia. The majority of the population survives on subsistence farming. Virtually the only significant economic asset that South Ossetia possesses is control of the Roki Tunnel that is used to link Russia and Georgia, from which the South Ossetian government reportedly obtained as much as a third of its budget by levying customs duties on freight traffic before the war.