Year	kg per kg of oil equivalent energy use
1960	2.8149392730367597
1961	2.770995854152193
1962	2.7536897722148166
1963	2.7253855249711467
1964	2.745889890696586
1965	2.745221428663835
1966	2.7268940134274526
1967	2.7120746230261927
1968	2.6824037754651147
1969	2.6837982104282894
1970	2.7632881166470087
1971	2.7240381092221373
1972	2.7187090622305443
1973	2.726857415258032
1974	2.691800366282912
1975	2.6400062322194877
1976	2.587399431945803
1977	2.573777048515046
1978	2.5767644668057668
1979	2.588680214755765
1980	2.5876108876548933
1981	2.556568748739607
1982	2.535957326562083
1983	2.5504986903266444
1984	2.520964958011308
1985	2.4985237245029737
1986	2.4906472423933774
1987	2.497857095392148
1988	2.5104616344554525
1989	2.5030677466453524
1990	2.4756706633099768
1991	2.4381533962223134
1992	2.4284330767834277
1993	2.4354112841600046
1994	2.426022401335541
1995	2.423313614039604
1996	2.4434357613872284
1997	2.5370045726369903
1998	2.5403549227269857
1999	2.4845370769054558
2000	2.4897108353900106
2001	2.5220269425148008
2002	2.4413752609220487
2003	2.457301831787217
2004	2.4350894575360122
2005	2.434459195408675
2006	2.416040376814228
2007	2.4208900090868357
2008	2.3979023354296904
2009	2.3404542274505005
2010	2.3902121323246983
2011	2.323151441885313
2012	2.2665416668604124
2013	2.3004324742154276
2014	2.2693346892053996
2015	2.257480032697492