The data collected show the position of China as trade partner of a country, in regards to both imports and exports, and the percentage of the country's goods and services imported by and exported to China.
CIA The World Factbook (https://www.cia.gov/library/publications/the-world-factbook).
The Observatory of Economic Complexity (http://atlas.media.mit.edu/en/rankings/country).
The indicator calculates the percentage of the goods and services exported by a country to China on the country's total exports.
Foreign trade data can suffer from mistakes and omissions and are usually not fully comparable. In other words, exports statistics of a given country rarely correspond to the imports statistics of its trade partner. Reasons requiring particular caution are the following:
1) The Harmonised System (HS) revision adopted by the country: the HS is the World Customs Organisation's international nomenclature to classify goods traded between countries for customs purposes, and has undergone different revisions, i.e. 1996, 1997, 2002, 2007 and 2012;
3) Exchange rate fluctuations are not always reflected in the trade figures;
4) Low-income countries tend to include re-imports into their import statistics and re-exports in their export statistics even if the UN recommendations state that import statistics should becompiled by country of origin (recommendation8.02), and export statistics by last known destination(recommendation8.09).
2) The official definition of exports and imports may vary between countries, e.g. China calculates exports using the Free on Board definition and imports using the Cost, Insurance and Freight definition, whereas the US calculates exports using the Freight Along Side definition while using only the Value of Goods definition for imports (see Martin 2013 http://fas.org/sgp/crs/row/RS22640.pdf);
For further issues consult the ITC Trade Map FAQ section, Methodology, C (http://www.trademap.org/stFAQ.aspx#li_Answer1_7).
ITC Trade Map (http://www.trademap.org/Index.aspx).