Human prosperity remains highly correlated to primary energy demand Figure 4 But the availability of energy remains strongly correlated to prosperity (see in Figure 4). In just the past 40 years, the global energy system has contributed to lifting over 1 billion people out of poverty, a 10-year increase in life expectancy, and a rise in literacy rates, from 70% to 90%. Approximately 60 countries that rank low or medium on the UN Human Prosperity Index, rely on less than 20 MWh of primary energy consumption per capita per year (see in Figure 4). Moreover, 750 million people still lack any access to electricity at all (see in Figure 4).25 Closing this access gap would be a major contribution toward alleviating poverty, particularly in sub-Saharan Africa. 60 Indonesia Costa Rica Mozambique South Africa China Japan Germany India 3 0 20 40 1.9 2.1 2.6 1.3 Low Medium High Very high 2 1 Primary energy use, by country (MWh per capita) Number of people at each level (billions) Level of human prosperity, based on HDI Titles Font size 9 Note: Countries with HDI >0.8 and with per capita energy consumption >60MWh are not shown. HDI = Human development index. HDI measures acountry's performance in terms of life expectancy at birth, average years of schooling, and gross national income. Low, HDI