Year	kg per kg of oil equivalent energy use
1960	3.4235293948353496
1961	3.410926371701969
1962	3.350493003628201
1963	3.466301925280194
1964	3.3637662185821604
1965	3.347508628471336
1966	3.2498407956367794
1967	3.2590146851619513
1968	3.1848750219863335
1969	3.159597762601164
1970	2.8627798761408365
1971	2.9162608983445377
1972	2.8718451815391184
1973	2.86784206974366
1974	2.862414339372414
1975	2.7092267636820173
1976	2.871224637117269
1977	2.782483229900728
1978	2.745124405651234
1979	2.756239274594233
1980	2.635257244725171
1981	2.4275544678599386
1982	2.390366349075292
1983	2.253387211922956
1984	2.0863786398987276
1985	1.966800250871958
1986	1.8629616800953042
1987	1.779378598380619
1988	1.7620463071834895
1989	1.7762011281367562
1990	1.5916184392679045
1991	1.6079077654874656
1992	1.5842858917076605
1993	1.4776815361445077
1994	1.5136271215264976
1995	1.4860542845404767
1996	1.469016878619075
1997	1.47908899122556
1998	1.5255069785400892
1999	1.5032481825949948
2000	1.481685664125901
2001	1.4465464635917487
2002	1.4212568344544914
2003	1.4175189955407135
2004	1.4011641826281582
2005	1.4059671005544445
2006	1.394371628676944
2007	1.3774739066603092
2008	1.353682669497747
2009	1.3579842944859313
2010	1.3320540958676508
2011	1.3268043880312768
2012	1.3350977493168814
2013	1.3305101312518621
2014	1.2550605744046237
2015	1.2638310016841163