Year	kg per kg of oil equivalent energy use
1960	3.0275091919647052
1961	3.1316785164033245
1962	3.198457174560109
1963	3.0143616662287767
1964	2.980500676746527
1965	3.113954107687475
1966	3.044715436963719
1967	3.0034920257797264
1968	2.9528048331130314
1969	2.7596935155727675
1970	3.0789427846459776
1971	3.020274759214497
1972	3.234744947933912
1973	3.0126231772099765
1974	3.0978469961719015
1975	3.1596203394038205
1976	3.215257925118039
1977	3.2259875290279263
1978	3.094688680314402
1979	3.097203707027723
1980	3.1761233910984332
1981	3.016213340659187
1982	3.138995341628003
1983	3.0126971149214614
1984	2.86225464567513
1985	2.838008697197989
1986	2.6316338454704087
1987	2.5742261765837853
1988	2.485382672023993
1989	2.572872882732823
1990	2.3871452704570535
1991	2.3783522232932053
1992	2.442842035712905
1993	2.3895108155026503
1994	2.371340899342506
1995	2.387113626787237
1996	2.317234055171379
1997	2.355663050073403
1998	2.3111033370773533
1999	2.394420517541722
2000	2.407017550482353
2001	2.3575979526206385
2002	2.4288661409815955
2003	2.392414491959566
2004	2.4140544876759265
2005	2.4694621066957985
2006	2.410149271295479
2007	2.466091159642378
2008	2.3308676393053656
2009	2.248568136307357
2010	2.1388644244719344
2011	2.182574244510356
2012	2.145418432524961
2013	2.0731849485645633
2014	2.1033758055619014
2015	2.1459403740904612