Year	kg per kg of oil equivalent energy use
1971	1.6554223457233852
1972	1.643574746494736
1973	1.6889084891155923
1974	1.7462587218742125
1975	1.5046732632804993
1976	1.6436328316247037
1977	1.5626720739536535
1978	1.5139774924953668
1979	1.7754904431321281
1980	1.728157571190626
1981	1.632342686180577
1982	1.5837886423137428
1983	1.5557558170712242
1984	1.5990991717250809
1985	1.616594013843104
1986	1.6595599250429822
1987	1.599958959742959
1988	1.7413769935110788
1989	1.5659516580749304
1990	1.641940932323234
1991	1.6285650444389064
1992	1.5647948833531755
1993	1.664106751449965
1994	1.6184987480059663
1995	1.6465296160689478
1996	1.6690447377309758
1997	1.6755596427932424
1998	1.5711064961445587
1999	1.514738003665584
2000	1.5258036005476774
2001	1.5427978535544913
2002	1.514169597513929
2003	1.4705953350751197
2004	1.459174010185356
2005	1.5736060889834256
2006	1.4868209426153098
2007	1.4700345042075889
2008	1.4850415156503378
2009	1.47182912940176
2010	1.4844161424104643
2011	1.4886971622073235
2012	1.5087271788127603
2013	1.5357553998877451
2014	1.3385307471120185