But the proportion quadruples to 26 per cent over die next 40 years, making it higher dian the projected OECD average of 25 per cent (see figure 1) (OECD, 2014). The world total fertility rate was 2.5 persons during 2010-2015, a reduction of 1.9 persons (-43.7 per cent) from the 4.4 persons during 1970-1975 (in bodi Latin America and Asia, die decline was -2.8 persons, while in Africa it was -2 persons). This decline resulted in an increase in die proportion of the older population.