According to Patrick Gerland from the UN's Demographic Estimates and Projections Section, DESA, it's quite simple - there have been many more births than deaths.
"A lot of families have a relatively large number of children, about four on average, or more." "The end result is that every year you keep adding about 600,000 more people in the country."
In the past infant mortality was high, but this is no longer the case.This is, in fact, an almost universal human societal response to disaster--have more kids. It is one of the reasons why fertility is so high throughout sub-Saharan Africa. As life drifts away from modernity and back to the "old days" the motivation to limit fertility seems to subside, in concert of course with the likely disappearance of health programs that provide contraception and other reproductive health services.
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