High fertility groups TFR in the USA in 2008, 2015 and 2023.
Utah Country, UT, used as a proxy for Mormons fertility, has in 2023 a TFR just at replacement level, which was the case of the USA still in 2007.
Fertility levels in China are extremely low, everyone knows this. Despite this, huge regional differences persist: In Northern China, fertility rates are much lower than in the south and belong to the lowest TFRs globally.
In natural fertility population, women have about half of their births after age 30.
The average fertility rate in natural populations ranged from 4-10; which means women had between 2-5 children (on average) after age 30.
tandfonline.com/doi/abs/10.108…
The demographic situation in New Zealand:
The TFR is in free fall and fell to 1.53 children per woman in the YE Jun 2024, down from 1.60 in YE Jun 2023.
In the same period, there was net negative migration of -55k of NZ citizens.
NZ's population is only ~5 million.
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