Year	PPP $ per kg of oil equivalent
2000	5.987614268901466
2001	6.378647624804297
2002	6.546058691726825
2003	6.530768361323453
2004	6.436556726208523
2005	7.049375744807133
2006	7.506130086163551
2007	7.600260068892195
2008	7.970689283358149
2009	7.713232238218002
2010	7.853031570890607
2011	9.445933547261314
2012	9.104208988840607
2013	7.347869079143412
2014	7.731696586585098