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The demographic data in this game were drawn from the United Nations
Population Division's (UNPD)
World Population Prospects: The 2002 Revision and
World Urbanization Prospects: The 2001 Revision.
Data for 2050 are according to the UNPD's "medium variant"
projections, which assume that fertility in high-fertility countries
such as Kenya will decline dramatically in coming decades, as they
have in the recent past. The UNPD's model also makes assumptions
about the impact of HIV/AIDS on mortality. There is uncertainty in
both assumptions.
For some categories, such as net migration, UNPD data are given for
a five-year period. For this feature, the 1950 data reflect the
period 1950-1955, the 2000 data reflect 2000-2005, and the 2050 data
reflect 2045-2050.
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