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Government statistics say it has prevented 400 million births .

政府统计表明这一政策减少了4亿人口出生。

The number of births was nearly flat at 1.07 million .

而出生人口则是维持在107万左右。

Over the whole period 52.4 % of births were of boys .

在整个研究时期中，男性出生率为52.4%。

But now economists say the phenomenon of fewer births is turning into a negative .

但是现在，经济学家认为低出生率现象已经开始变为负面影响。

After the end of the second world war births surged across the rich world .

第二次世界大战结束后，发达国家的人口出生率直线上升。