Year	kg per kg of oil equivalent energy use
1960	2.6199215732164256
1961	2.579007932005383
1962	2.762152794454317
1963	2.733916168422884
1964	2.6740615274136093
1965	2.66810587559549
1966	2.7089242546195136
1967	2.6629393266483494
1968	2.7329885693709026
1969	2.659429299104813
1970	2.550035491460059
1971	2.559240915544001
1972	2.5162926503077325
1973	2.4465465669853383
1974	2.350018720902084
1975	2.2754165378541256
1976	2.276993460707013
1977	2.27291736995045
1978	2.243986962625687
1979	2.084312021785838
1980	2.023276166690623
1981	1.97704368893634
1982	1.9204888792814043
1983	1.9671961561099922
1984	1.8772925988940552
1985	1.8038197658851118
1986	1.8346125539716278
1987	1.7925672645934618
1988	1.7965519875445755
1989	1.7782673114002445
1990	1.7786012879158553
1991	1.8465327879855284
1992	1.8395786761031283
1993	1.7939203728910185
1994	1.7426744557681686
1995	1.803179922737227
1996	1.7917926370310164
1997	1.710361775722801
1998	1.7491976321754015
1999	1.7571342887808572
2000	1.74801963092831
2001	1.7004696511917277
2002	1.6830113581055712
2003	1.7249323077551593
2004	1.7355541373686498
2005	1.767385065330223
2006	1.679127704233691
2007	1.690512706023956
2008	1.679789147605643
2009	1.6196341043686726
2010	1.72591447412348
2011	1.6240939682869138
2012	1.6581668857708862
2013	1.6267503607528442
2014	1.5856008130025492
2015	1.5919890685864622