TOKYO -- Married women in Tokyo give birth to more babies than the national average, but the city's total fertility rate has dropped to the lowest level among Japan's 47 prefectures. This decline is largely attributed to an increase in unmarried women relocating to the city for work and education.
The total fertility rate signifies the average number of children a woman would have if she lived past her childbearing years. It is calculated by the Ministry of Health, Labor and Welfare as the ratio of annual births to the population of women ages 15 to 49.
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