But oil earnings tumbled and foreign investment dried up, even as the population tripled.
但是近来石油收入大幅减少，外国投资枯竭，而人口却增加了三倍。
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This part applies SPSS and EXCEL statistical software to analyze the relationship between service industry and GDP, investment, and population. It is the creation of the whole article.
As China develops and has access to increased state revenue so investment to the less privileged rural population is increasingly vital for reducing income gaps and maintaining social stability.