Based on a comparison of 137 countries in 2015, Hong Kong ranked the highest in GDP per unit of energy use in PPP prices per kg of oil equivalent with USD 27.8 followed by Ireland and Sri Lanka. On the other end of the scale was Dem. Republic of the Congo with USD 2.18, Trinidad and Tobago with USD 2.21 and Mozambique with USD 2.57.
Data for more countries are available at GDP Per Unit of Energy Use (PPP $ Per kg of Oil Equivalent) indicator page.
| GDP Per Unit of Energy Use (PPP $ Per kg of Oil Equivalent) | Unit | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 |
| Bangladesh | USD | 14.3 | 14.1 | 14.8 | 16.0 | 17.0 | ... | |||||||||||||||
| Colombia | USD | 14.9 | 15.6 | 17.0 | 17.6 | 17.6 | ... | |||||||||||||||
| Cuba | USD | 15.8 | 17.9 | 18.9 | 18.7 | 20.3 | ... | ... | ||||||||||||||
| Denmark | USD | 12.1 | 12.2 | 13.7 | 14.5 | 15.0 | ||||||||||||||||
| Dominican Republic | USD | 14.1 | 14.7 | 15.2 | 14.6 | 16.4 | ... | |||||||||||||||
| Ghana | USD | 13.2 | 13.3 | 14.5 | 15.3 | 15.7 | ... | |||||||||||||||
| Hong Kong | USD | 21.8 | 25.3 | 25.0 | 26.2 | 27.6 | ... | |||||||||||||||
| Ireland | USD | 13.2 | 13.7 | 15.7 | 16.2 | 17.0 | ||||||||||||||||
| Malta | USD | 14.1 | 14.3 | 14.5 | 14.5 | 17.9 | ... | |||||||||||||||
| Mauritius | USD | 15.1 | 15.1 | 16.0 | 16.1 | 16.5 | ... | |||||||||||||||
| Panama | USD | 15.3 | 15.3 | 16.0 | 17.4 | 20.1 | ... | |||||||||||||||
| Singapore | USD | 15.6 | 15.1 | 15.8 | 16.8 | 17.0 | ... | |||||||||||||||
| South Sudan | USD | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | ... | 23.9 | 32.1 | ... | |
| Sri Lanka | USD | 17.4 | 17.6 | 18.2 | 19.3 | 23.1 | ... | |||||||||||||||
| Switzerland | USD | 15.3 | 16.4 | 18.1 | 18.7 | 18.8 |
Helgi Library 
