Year	kg per kg of oil equivalent energy use
1960	2.835964970841763
1961	2.7941969652166923
1962	2.7731748431572405
1963	2.753191408409484
1964	2.76491597980569
1965	2.7666501300269584
1966	2.749224205979976
1967	2.7311025196753747
1968	2.698727075188839
1969	2.708257984446106
1970	2.7891450175002706
1971	2.7444745118956337
1972	2.7387794889263732
1973	2.7574319749274054
1974	2.7185909697428694
1975	2.6647755603642294
1976	2.6118699905916527
1977	2.5987930428866135
1978	2.6039292616261163
1979	2.615627223724068
1980	2.6172029138695723
1981	2.584722565060173
1982	2.5609991969314994
1983	2.5796968928076556
1984	2.549500790636895
1985	2.5324097322826646
1986	2.5380258216897014
1987	2.5386900010007643
1988	2.5491771441743905
1989	2.544364896204504
1990	2.5299534998077715
1991	2.4904430041561074
1992	2.4780627529688957
1993	2.4953780798188463
1994	2.4853095215896475
1995	2.4799774532130794
1996	2.499989726737288
1997	2.5991776438222542
1998	2.5970868341290325
1999	2.5375680256604696
2000	2.5409307488087736
2001	2.5773246874922595
2002	2.4797428710158487
2003	2.5029657671948167
2004	2.4872647693717482
2005	2.482384091949417
2006	2.462782441307979
2007	2.456254092658548
2008	2.443189834152765
2009	2.383361784709345
2010	2.434458518536513
2011	2.361239109146983
2012	2.2949770086369585
2013	2.3318699349357845
2014	2.302414400682524
2015	2.2832671747612903