Year	PPP $ per kg of oil equivalent
1995	2.964644293027306
1996	3.0566392988503592
1997	3.182391196712766
1998	2.959268700912369
1999	3.378246352442725
2000	3.826852175324056
2001	4.2099260356332815
2002	3.9129087320542344
2003	4.2029131182490085
2004	5.781688729359725
2005	6.661389915134986
2006	7.620992757661553
2007	8.506000582152675
2008	9.221957132744631
2009	6.3768749135508855
2010	6.557169256893133
2011	6.849466202256943
2012	7.310020996722399
2013	7.608850343933198
2014	7.545759288187338