16 Foreign Economy Brief Introduction      ¢ñ. The data in this chapter show the development of Guangdong's foreign trade, utilization of foreign capital, contracted projects and labor services cooperation with foreign countries or regions, and registration status of enterprises with foreign investment over the years.ª¥      ¢ò. The data in this chapter are prepared and edited by the Division of Trade and External Economic Relations Statistics of Statistics Bureau of Guangdong Province.ª¥      ¢ó. Data sources and statistical coverage:ª¥      (1) The data on the average exchange rates of RMB yuan to US dollar, Japanese yen and Hong Kong dollar over the years come from the State Administration of Foreign Exchange. The annual average exchange rate is calculated as the weighted mean of the daily exchange rates provided by the State Administration of Foreign Exchange in current year.ª¥      (2) The data on the size and composition of [BF]Guangdong's imports[BFQ] and exports come from Guangzhou Customs Office. The statistics cover the operating units (with or without the right to handle imports and exports) which have a declaration and register at customs within the boundary of Guangdong. The values of export commodities are calculated on an FOB basis, while the values of import commodities are calculated on a CIF basis. The Harmonized Commodity Description and Coding System (HS) stipulated by the Customs Cooperation Council is used in the classification of import and export commodities.ª¥      (3) The data on the scale and composition of the utilization of foreign capital and the conditions of contracted projects and labor cooperation with foreign countries or territories in Guangdong come from the Department of Foreign Trade and Economic Cooperation of Guangdong Province.      (4) The data on registration status of enterprises with foreign investment come from the Administration of Industry and Commerce of Guangdong Province.ª¥      (5) The data on the distribution of ports opening to the outside world come from the Department of Foreign Trade and Economic Cooperation of Guangdong Province.