4 ms·100%, but the OP is talking about 30-40 years in the future.by sarchertech 1y ago100%, but the OP is talking about 30-40 years in the future.bell-cot 1y agoYeah. https://en.wikipedia.org/wiki/Lost_Decades https://en.wikipedia.org/wiki/Lost_Decadesslaw 1y agoMore like 70-80 years. Total fertility rate in Africa was 4.02 year ago.