Data from representative national surveys conducted from 1981 to 2007 show the happiness index rose in an overwhelming majority of nations studied, according to WVS.

 
  • “全球价值调查”称,从1981年到2007年间所做的全国抽样调查的数据显示,绝大多数受调查国家的幸福指数都有所上升。
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