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	3.295782463431774
1972	3.3317299675815972
1973	3.2814747555645356
1974	3.2787473165977317
1975	3.293259246921097
1976	3.297117549223985
1977	3.2706762356119228
1978	3.1940894324574782
1979	3.2022641852876577
1980	3.217241711323831
1981	3.179653411252542
1982	3.1552625556859075
1983	3.163637991487297
1984	3.209456110749446
1985	3.2189049096912403
1986	3.198473013807523
1987	3.202380087760191
1988	3.100165587510344
1989	3.1706684482785836
1990	2.6302247676894512
1991	2.6154253171279342
1992	2.658825396710131
1993	2.5966235022925517
1994	2.6154963101835254
1995	2.589083773674524
1996	2.562018415308338
1997	2.522410669805473
1998	2.537010258602914
1999	2.5079973849027937
2000	2.52154103394075
2001	2.5041138689475186
2002	2.497729783966277
2003	2.489945045280124
2004	2.478772053114671
2005	2.4683583100139646
2006	2.4940821938592714
2007	2.4988312555300682
2008	2.504692916422642
2009	2.484283427222297
2010	2.452462776487116
2011	2.4684991730176447
2012	2.4328653178376847
2013	2.427535213701938
2014	2.4048028962414048
2015	2.856500200651482