Year	kg per kg of oil equivalent energy use
1960	1.5735021773423372
1961	1.6003260700157431
1962	1.824880771646109
1963	1.8209319758097944
1964	2.0068482978430437
1965	1.9831323687322107
1966	2.079713766441332
1967	2.1328516286322694
1968	2.1974667800346968
1969	2.227591524560191
1970	2.341257631278414
1971	2.3835156769987966
1972	2.3859884809186234
1973	2.3884899827989443
1974	2.366995040144523
1975	2.423348630797152
1976	2.4669603713859667
1977	2.4596716586080336
1978	2.4971406569862404
1979	2.524335983229026
1980	2.4782775314716603
1981	2.4740468989447932
1982	2.5635306451640534
1983	2.5782746717066507
1984	2.5860396334891513
1985	2.6760088009263483
1986	2.7077187372666627
1987	2.7294454655844724
1988	2.7610115308442387
1989	2.797736047731008
1990	2.4344986700602793
1991	2.4986288147361706
1992	2.540484105912223
1993	2.552722727593908
1994	2.5662535233168318
1995	2.616383554962204
1996	2.5831531597135564
1997	2.597319438706178
1998	2.6441320887178787
1999	2.564759187809884
2000	2.617177530285423
2001	2.6370736611914127
2002	2.6621586564587147
2003	2.6815813099208663
2004	2.7271911792800942
2005	2.7847279092834105
2006	2.81495996570648
2007	2.834662472542659
2008	2.8390888598854085
2009	2.8463735879354197
2010	2.851810766789167
2011	2.899529992668751
2012	2.8798072812002418
2013	2.8939583172749908
2014	2.8563410080540024
2015	2.599867802882943