Year	kg per kg of oil equivalent energy use
1960	3.339040210018144
1961	3.32525071167327
1962	3.322401256948315
1963	3.4597970539498695
1964	3.527973316826496
1965	3.4556002938782435
1966	3.4246564975303233
1967	3.4023785183170983
1968	3.4522626495587767
1969	3.4350085411505344
1970	3.419330470144511
1971	2.3970027901959785
1972	2.421521270881853
1973	2.4400327204741785
1974	2.417005637315379
1975	2.4489170163123997
1976	2.486581475050227
1977	2.49187019981499
1978	2.520355971752877
1979	2.517359029160026
1980	2.480708696933165
1981	2.4306007415768907
1982	2.4746280790602952
1983	2.508931137536645
1984	2.515181714244223
1985	2.5820660643169644
1986	2.595249787002079
1987	2.624739395966845
1988	2.64868416139514
1989	2.663402552103934
1990	2.405552181996712
1991	2.4482984188649533
1992	2.471869000232806
1993	2.4725606392813826
1994	2.481743742700959
1995	2.5179546062200284
1996	2.5003010025723014
1997	2.5109045964123924
1998	2.5351976167374257
1999	2.478563581392761
2000	2.515658990171506
2001	2.530328012577613
2002	2.5458074005663964
2003	2.5774415996035636
2004	2.608092917036404
2005	2.649390124547436
2006	2.6796686970256056
2007	2.715267815466375
2008	2.714855365425661
2009	2.7194985890180488
2010	2.724956642007452
2011	2.7856323049298743
2012	2.774969615273687
2013	2.7888525626760594
2014	2.767456944569264
2015	2.669997384153165