Abstract】Declining fertility and increasing longevity will profoundly change the population age distribution in many countries over the coming decades.
High fertility rates, high infant mortality rates and the cultural value of large families have all been cited as factors driving Nigeria's population boom.
中国の出生率(1人の女性が生涯に出産する子どもの数の推計値)は現在約1.4。
China's fertility rate- the average number of children born to each woman- is currently estimated at around 1.4.
例えば、ヨーロッパや日本の出生率は、人口を一定に保つに必要なレベルの75%以下です[10]。
In Europe and Japan, for example, the birthrate is less than 75 percent of that needed to maintain the population at a constant level.10.
高い出生率と教室の大きさから、ユタ州は学生一人あたりに費やされる額が他に比べ少ない。
Because of high birth rates and large classrooms, Utah spends less per student than any other state.
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