这个人数是基于人口数量的。
基于历史和人口的原因，俄罗斯青少年人口数量在过去13年里下降了1200万左右，平均每年100万人。
For historical and demographic reasons, the child population in Russia decreased by approximately 12 million over the last 13 years.
根据预测的结果，文章中计算了基于城市经济承载力的北京市最优人口数量。
And according to the forecast results, this article has estimated the optimum population size considering urban economic carrying capacity.
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