Year	kg per kg of oil equivalent energy use
1960	2.9465552864691484
1961	2.9295025174631473
1962	2.9045920853139844
1963	2.878540851527518
1964	2.880773782178259
1965	2.878711116230294
1966	2.8573405624548016
1967	2.82116929098074
1968	2.797818913893787
1969	2.789279175963942
1970	2.8337782757048324
1971	2.819997950762421
1972	2.810154242013901
1973	2.796930718505155
1974	2.7628241615447173
1975	2.728408102099136
1976	2.693481354419191
1977	2.6771627172011248
1978	2.667610070802081
1979	2.6803402824938116
1980	2.6763893869192836
1981	2.644702584462039
1982	2.6178507632131187
1983	2.597467138355597
1984	2.555112316077276
1985	2.526408248778726
1986	2.495506089853696
1987	2.48641192859135
1988	2.4906834407194975
1989	2.5000786127853236
1990	2.473912665554762
1991	2.4429647231705682
1992	2.4302336883469846
1993	2.4131746140948533
1994	2.403180992106972
1995	2.3848630353287588
1996	2.381718133633302
1997	2.4105659330331233
1998	2.4033276580873877
1999	2.376706368606403
2000	2.3794027503203017
2001	2.393274347614097
2002	2.3563044971695777
2003	2.365489230587385
2004	2.3374666418774823
2005	2.3337718316476237
2006	2.3202099223979604
2007	2.336750479732865
2008	2.303672685906159
2009	2.264899117243642
2010	2.272880742663564
2011	2.2767090341052647
2012	2.2591472222362365
2013	2.267500703330878
2014	2.2340369377636318
2015	2.2240630591059616