Year	kg per kg of oil equivalent energy use
1960	2.828317796511405
1961	2.893346619015949
1962	2.8375419322069733
1963	2.8263197603724453
1964	2.9060682053548286
1965	2.836198821067085
1966	2.8178723564301973
1967	2.8214261636504325
1968	2.791588423428412
1969	2.7531335844085794
1970	2.807368650676583
1971	2.772012726363207
1972	2.835021900203163
1973	2.8014892329481325
1974	2.76977508515354
1975	2.703297093794439
1976	2.6931687697537567
1977	2.6553246131747397
1978	2.6274846915270773
1979	2.5992559315073143
1980	2.2590323026046115
1981	2.5599366778944175
1982	2.512921421486049
1983	2.417654853874206
1984	2.442464573707366
1985	2.3695023314850854
1986	2.3335284955118953
1987	2.4012696683572456
1988	2.194381103538726
1989	2.2626589226093903
1990	2.3423158553639456
1991	2.356868476204483
1992	2.266212763937454
1993	2.2456160853557896
1994	2.2708043898945816
1995	2.2816150716972734
1996	2.2774622823821624
1997	2.2700788688036515
1998	2.247892448756777
1999	2.1963356899672744
2000	2.2209181120958514
2001	2.2466953546273474
2002	2.274538763245696
2003	2.307300153906774
2004	2.314523251721961
2005	2.2680113538599866
2006	2.197102706456938
2007	2.13648696883902
2008	2.107976373378795
2009	2.032869114217518
2010	2.064826033831921
2011	2.0743705127152956
2012	1.9871561530866522
2013	1.9784668780421562
2014	1.9273855399135769
2015	1.922676204520868