Based on a comparison of 130 countries in 2015, South Sudan ranked the highest in GDP per unit of energy use in constant PPP prices per kg of oil equivalent with USD 31.9 followed by Hong Kong and Ireland. On the other end of the scale was Trinidad and Tobago with USD 2.25 , Turkmenistan with USD 2.54 and Dem. Republic of the Congo with USD 2.65 .
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