The decline of fertility rates on the other hand, – the number of children per woman – reduces population growth.
The global average fertility rate was 5 children per woman until the end of the 1960s and has halved since then.
Global population projections are also published by the US Census, the Population Reference Bureau (PRB), and by the closely related Austrian research centers IIASA and the Wittgenstein Centre.
The World Bank also published projections for some time but has stopped doing so in the mid–90s.
Then in the 1960s the fertility rate in the ‘less developed regions’ started to fall and another decade later the fertility rate in the ‘least developed regions’ followed this decline.
The fertility rate of the world was still at 5 children per woman until the mid-1960s.
, population growth has slowed considerably: The fastest world population growth rate was already reached in the late 1960s, and it has been falling since.
While the world population increased by 2% annually in the late 60s it has now slowed to an increase of just about 1%.
The UN projections are called ‘assessments’ and a new update is published in their series every two years.
The scenario which the UN researchers see as the most likely scenario is the Medium Variant projection.