Year	PPP $ per kg of oil equivalent
2000	5.694979239046804
2001	5.666511188824587
2002	8.465406512126552
2003	8.601488675207243
2004	8.746739284764658
2005	8.227582390708307
2006	9.440422322722497
2007	10.7720388377717
2008	10.825625962555673
2009	11.173758494285499
2010	9.996700122741686
2011	11.087310372499505
2012	10.958707883999013
2013	13.300228337484679
2014	13.838087374282551