The amount of the energy supply (that is, TPES (total primary energy supply, unit: toe)/GDP (2000 USD)), net import of energy (unit: Mtoe), amount of CO2 (that is, CO2/pop., unit: tCO2/capita), and energy consumption (that is, Elec.Cons. /pop., unit: kWh/capita) came from the World Energy Agency [36] (2009).