人口自然增长
人口自然增长是指人口再生产的变化量,即出生人数与死亡人数的净差值。通常以一年内城市人口的自然增减数与该城市总人口数(或期中人数)之比的千分率表示其增长速度,称为自然增长率。人口自然增长率=本年出生人口数-本年死人口数亡/年平均人数X100‰
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