Year	constant 2011 PPP $ per kg of oil equivalent
2000	1.86037270743277
2001	1.77266735626802
2002	1.81285424779035
2003	1.90639871661739
2004	1.80643422824114
2005	1.88989424175584
2006	1.94885408789675
2007	1.75983964028502
2008	1.87967487210542
2009	1.82399167159657
2010	2.05213114353061
2011	1.73728685223983
2012	2.06330699457209
2013	2.31167471022255
2014	2.09018842103056