Year	kg per kg of oil equivalent energy use
1960	1.552079914522625
1961	1.4865540187092954
1962	1.584662674197592
1963	1.72641501272866
1964	1.875829421310032
1965	1.9218922983228495
1966	2.1021625048700816
1967	1.9873767996956564
1968	2.154211601449035
1969	2.2364154898967206
1970	2.2647569206949645
1971	2.2337295582979646
1972	2.272670037082326
1973	2.348121247437196
1974	2.2701670845417476
1975	2.3398997581506773
1976	2.4330906948339512
1977	2.3464830973957316
1978	2.3418021617106284
1979	2.2974465054705964
1980	2.3678880025360836
1981	2.1747311379660603
1982	1.8573874827409467
1983	1.7749786956599514
1984	1.7626596817998312
1985	1.922492049074057
1986	1.9777798051599222
1987	1.9611720777421746
1988	1.8871406229229186
1989	1.8409975072820972
1990	1.9224381476843342
1991	1.914712994316258
1992	1.9269524325820973
1993	1.8784704794815223
1994	1.972007886057233
1995	1.939500583267888
1996	2.0114285273414603
1997	1.8789618757333593
1998	1.7585481730889192
1999	1.7409321112571148
2000	1.6998610031987311
2001	1.8368305727504726
2002	1.8129523039511701
2003	1.9437481823948672
2004	1.8143680092176757
2005	1.611038536268367
2006	1.7894454438615024
2007	1.7647883571463194
2008	1.598939879719423
2009	1.6189735815066244
2010	1.7072957830012587
2011	1.564728076831101
2012	1.4542257929680458
2013	1.5087481691886568
2014	1.3602744689684145
2015	1.3189760236526098