According to Bank of Thailand's document (enclosed), Bank of Thailand and Customs Trade Department adopt two different methodologies in calculating thetrade statistics. This includes, but not limited to, different timing in realizing the trade. Goods not passing through the Customs such as satellite,some military goods, and electricity from neighboring countries are included in Balance of Payment Concepts as well. Furthermore, the two institutions usedifferent exchange rates. THNF reports freight on board series. Foreign trade statistics refer to transactions involving movements of goods out of or into the Kingdom of Thailand over a specific time period. The figures cover all categories of goods that enter or leave the Kingdom of Thailand and pass through customs formalities at any of the Customs Houses and representative offices, either via land, sea or air transport. The data also include postal packages but do not include smuggled goods and products procured on carriers at sea. Bank of Thailand obtains electronic copy of the data and tabulates them into export and import tables, classified in accordance with the Standard International Trade Classification (SITC). Value of exports and imports is based on Baht equivalent figures as announced by the Customs. History is stored independently for monthly, quarterly and yearly frequencies. HP values for these frequencies may not match each other. Note that when only one frequency is stored in history, for the other frequencies, history is derived from that of the stored frequency. For example, HP W, HP M, HP Q and HP Y will derive data from HP D when only daily history is stored, HP Q and HP Y will derive data from HP M when only monthly history is stored. As another example, if both daily and monthly are stored, HP W will derive data from HP D, while HP Q and HP Y will derive data from HP M and so on.