Year	kg per kg of oil equivalent energy use
1971	0.8623256360833351
1972	0.896677540429576
1973	0.9947393226789547
1974	0.9746718686160308
1975	0.9329335578659725
1976	0.8472430512077576
1977	0.8496602039444713
1978	0.8384671333693846
1979	0.8596699584526628
1980	0.8472540586290975
1981	0.6736541521675792
1982	0.6288080817855293
1983	0.7044111077347525
1984	0.5824045683055671
1985	0.7573380298756792
1986	0.8736181218698379
1987	0.9630529515649892
1988	1.041434773961497
1989	1.0641305777514716
1990	0.9640658627113503
1991	1.127349196782118
1992	1.1823580879116768
1993	1.3143468333294217
1994	1.4119303684061904
1995	1.4767090823563036
1996	1.3675829264592405
1997	1.4975175550154736
1998	1.5515508941530338
1999	1.4794416940424913
2000	1.419160174786086
2001	1.4143027692144596
2002	1.4037336479209144
2003	1.473744261226264
2004	1.5246397068674746
2005	1.5174395736261017
2006	1.527222261535228
2007	1.703674130679621
2008	1.536357192597382
2009	1.5857167748419863
2010	1.5387952879923614
2011	1.5800004567552943
2012	1.6023205957129758
2013	1.6195290128845317
2014	1.620807727932543