To make matters worse for the future of Japan's population, the country's fertility rate has been about 1.41 births per woman, putting it well below the "population replacement rate" of about 2.1 (the average number of children born per woman to replace the population for nearly forty years since the 1970s). 
Hali ya idadi ya Raia nchini Japan inaonekana kuwa mbaya zaidi kwani kiwango cha uwezo wa kuzaa kimekuwa cha wastani wa uzao wa 1.41 kwa kila mwanamke, hali inayoiweka Japan kuwa chini ya "wastani wa kuleta kizazi kipya" cha 2.1 (Wastani wa idadi ya watoto wanaozaliwa na mwanamke mmoja ili kuweza kuleta kizazi kipya kwa takribani miaka arobaini tangu miaka ya 1970).