China, meanwhile, is warier of external influences, and remains about 90% Han Chinese.

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The service outage was not caused by external influences.

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Property damage claims were analyzed over a two-year period (from January 2009 to December 2010) to ensure the findings would not be impacted by external influences such as weather or road construction.

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Weather is caused by disturbances within the atmosphere, but climate is controlled by external influences, such as the distribution of oceans and continents, the extent of ice and snow-cover, variations in the amount of energy from the sun, and changes in the chemical composition of the atmosphere.

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It said this had been done in order to place greater weight on external economic influences over which there was limited control.

BBC: Deputy Charles Parkinson