Source: Central Bank. Formally, the Central Bank of Turkey Latest actual data: 2010 Base year: 2003 Methodology used to derive volumes: Deflation by unit value indexes (from customs data) Formula used to derive volumes: Fisher. Trade volumes are the ratio of the value index to the Fisher unit value index (chain-weighted). The value indices are obtained as the ratio of current values to the arithmetic average of the base year values. Foreign trade indices have been calculated by Eurostat and U.N. concepts and methods. Chain-weighted: Yes, from 2003. Unit value indices are chain-weighted, but volume indices are not. Trade System: Special trade. Relaxed definition. Foreign trade statistics include goods which enter/leave the statistical territory of Turkey from/to other countries and are placed under the customs normal export and import procedures and under customs inward and outward processing procedures. Excluded items in trade: In transit;Low valued;Other;. Excluded items include goods valued under $100, transit trade, temporary export/import trade, repair and maintenance of goods, operational leasing, shuttle trade, border trade, some transactions with declaration that are not goods (cash, valuable paper, stamps, monetary gold, etc.). Other exclusions include border and coastal trade. Customs warehouses, free zones, and duty-free shops in Turkey are considered beyond the customs frontier. Note that while Turkstat and the Central Bank of Turkey make estimates on shuttle trade for BOP data, these are not included in the foreign trade statistics disseminated by Turkstat. Excluded items in manufactures: All items included. The classification used for compiling Turkey's foreign trade statistics is the Harmonized System (HS) 12-digit. The first 8-digit (CN) is international and the last 4-digit is national. Furthermore, the data are available in SITC Rev. 3, SITC Rev. 2, ISIC Rev. 3, ISIC Rev. 2, BEC, CPA, and CPC classification. There are no important differences between Turkey's methodology reported in the IMF SDDS and relevant international or regional standards. Oil coverage: Primary or unrefined products;Secondary or refined products;Other;. All items covered. Valuation of exports: Free on board (FOB) Valuation of imports: Cost, insurance, freight (CIF)