Year	kg per kg of oil equivalent energy use
1960	3.3815767659544314
1961	3.4009942272233067
1962	3.4599762549206954
1963	3.471866763804484
1964	3.517632621859221
1965	3.300549472513682
1966	3.4064409110863147
1967	3.315562065083585
1968	3.421398984208784
1969	3.2823016441143946
1970	3.1725736462408687
1971	3.0835751391878734
1972	3.096682474986544
1973	3.120668822758694
1974	3.128366695158684
1975	3.1923269442615565
1976	3.165053309727374
1977	3.173434911784097
1978	3.0744646778237574
1979	3.062707638268607
1980	3.154902074935653
1981	2.9904298122328687
1982	3.065697105074809
1983	3.0344436803571213
1984	2.967123403067715
1985	3.1126466074118584
1986	3.0085761987041724
1987	2.979006576213247
1988	2.9497247958242423
1989	2.7839780065490505
1990	3.0000281684672503
1991	3.2586391729570665
1992	3.0950301286334914
1993	3.1345123448980745
1994	3.2275625155721337
1995	3.0891081921994448
1996	3.3396595506403783
1997	3.133133233048812
1998	2.9857909039734363
1999	2.9708926066656587
2000	2.828821217694027
2001	2.8038637189979756
2002	2.8403884291689057
2003	2.9529489828548816
2004	2.7719761798310416
2005	2.6596498891274654
2006	2.8715786233392593
2007	2.6990706099111086
2008	2.605532649996179
2009	2.6044798031537537
2010	2.4737138382365718
2011	2.3946877833410536
2012	2.210356907562018
2013	2.2782497411895757
2014	2.20586915408434
2015	2.098926792494413