How much has world demo. changed since 1950, only 74 years, 1 lifetime, Tanzania (TZ) pop in '50 = 8m same level as Portugal, Czechia, Hungary, Greece, Bulgaria in '50 7.3m - 9.3m, those countries today have between 50,000 (Bulgaria) - 90,000 (Czechia) births
TZ has 2.3m births