Year	kg per kg of oil equivalent energy use
1971	1.0868465106067675
1972	1.8581851996603818
1973	1.7867828716214438
1974	1.756319514661274
1975	1.4748981988058656
1976	1.4861035174047748
1977	1.4677192115747921
1978	1.418498477426784
1979	1.4849894710318388
1980	1.3693626200306164
1981	1.272422055603228
1982	1.2208451498295267
1983	1.399372563709366
1984	1.4343648994548994
1985	1.6008645239802484
1986	1.5840643608009433
1987	1.7557824334666703
1988	1.5934825463314377
1989	1.7839986981440077
1990	1.7407641954818165
1991	1.840942562592047
1992	1.8504733426698123
1993	1.9733053401401182
1994	2.0633094390257902
1995	1.981192729150503
1996	2.0217723534560377
1997	1.9798713083649562
1998	2.055510260326355
1999	2.4142078325681027
2000	2.405245216234514
2001	2.4226450381967224
2002	2.4812952170895644
2003	2.493132553058394
2004	2.4664403833756574
2005	2.548233497390213
2006	2.656964184927928
2007	2.72213415317609
2008	2.7153308204133406
2009	2.7430463374315943
2010	2.7785432689789307
2011	2.7587879522820633
2012	2.7814938933904845
2013	2.7723749528260804
2014	2.8185496243123094