The TFR was initially a three nautical mile radius from the site and extended from the surface to 3, 000 feet.

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But many developing countries have high TFRs, the largest of these being India, with its 2012 TFR estimated to be 2.6.

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In keeping with its dirigiste traditions, South Korea actually has a five-year plan to encourage breeding, and a TFR target of 1.7 for 2030.

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That is the TFR only goes up if women really are having more children on average, not if there are simply more children being born overall, and life expectancy goes up only if there are declines in age-specific mortality.

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Its TFR in 1939 was 2.6.

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When the cohort born roughly in the years between 1993 and 2005 enters prime child-bearing years, there is going to be a pretty significant decline in the crude birth rate even if the total fertility rate (TFR) continues to move modestly higher.

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