Year	kg per kg of oil equivalent energy use
1960	2.997186355432256
1961	3.135031143363422
1962	3.2747510839690386
1963	3.245590449520149
1964	3.2615553113042712
1965	3.156843908929329
1966	3.210089929719505
1967	3.1995965584266086
1968	3.249401732309737
1969	3.197270384048568
1970	3.243959820085045
1971	3.3487113954499175
1972	3.309122327012741
1973	3.309308070341231
1974	3.2747825644605806
1975	3.3177851802751492
1976	3.262939185327709
1977	3.25820007042348
1978	3.2498126339067825
1979	3.2032868140896875
1980	3.188068415007006
1981	3.1513707706886342
1982	3.1096689469454804
1983	3.1347475054886926
1984	3.0804287561257984
1985	3.0977016816779575
1986	3.219007945508773
1987	3.26980894227425
1988	3.265128412284794
1989	3.219927640272461
1990	3.127885726831851
1991	3.1528075045423543
1992	3.1988516132834466
1993	3.152278400642063
1994	3.116026688186282
1995	3.146535923968728
1996	3.079895825913511
1997	3.0222573578799152
1998	3.0476672656655577
1999	3.0266559877106345
2000	3.088315385549582
2001	3.128015224539743
2002	3.0591565438616293
2003	3.14774565674097
2004	3.09756529710457
2005	3.20963786049849
2006	3.267169227133728
2007	3.1290506465662093
2008	3.134289601596966
2009	2.8716523320904206
2010	2.8267051631025577
2011	2.770569209481778
2012	2.8271478741600666
2013	2.7443227016182132
2014	2.783968071527697
2015	2.789816829179719