Year	kg per kg of oil equivalent energy use
1971	1.6046768209429305
1972	1.6100615858331033
1973	1.7091377333223368
1974	1.7164586015201042
1975	1.6837123327506387
1976	1.7266353761433797
1977	1.7581012660820823
1978	1.7984433280456493
1979	1.7721352412261275
1980	1.7220526801976017
1981	1.652112895405059
1982	1.645866301178203
1983	1.7136844279073282
1984	1.7289620540164958
1985	1.7633756679105062
1986	1.7595627102278013
1987	1.7787328572096994
1988	1.8349326806074122
1989	1.7930710414549578
1990	1.9799521129753785
1991	1.984653143071885
1992	1.9808633121038788
1993	1.9514585881066717
1994	1.9461509812138165
1995	1.9542105517365516
1996	1.9554503502018572
1997	1.9680434133930682
1998	1.964689062650947
1999	1.9764520136820356
2000	1.982774740867853
2001	1.9925076678746352
2002	1.9961647901890431
2003	2.0251499819180383
2004	2.0243329943964525
2005	2.0241835864398006
2006	2.067046844568349
2007	2.126397922500898
2008	2.124154888690481
2009	2.131562117153967
2010	2.1448594337323885
2011	2.2085364928785216
2012	2.2150394278925845
2013	2.227445333087785
2014	2.247942000198136