Imports reported by one country do not coincide with exports reported
by its trading partner. Differences are due to various factors
including valuation (imports CIF, exports FOB), differences in
inclusions/ exclusions of particular commodities, timing etc.
For furher information please refer to the recommendations for
international merchandise trade statistics that can be found in the
International Merchandise Trade Statistics: Compilers Manual at
http://unstats.un.org/unsd/trade/methodology%20IMTS.htm.
Additional methodological information can be found on the same web
page.
Sam