Year	kg per kg of oil equivalent energy use
1971	2.776353869850739
1972	2.5287160421530954
1973	2.7356003864811065
1974	2.9145972482079956
1975	2.80520918621235
1976	2.6980011808474673
1977	2.6992875064254895
1978	2.621392321527516
1979	2.9988114706889877
1980	2.9488766459694418
1981	2.9197494217992723
1982	3.0178362962605214
1983	3.0264044138417057
1984	2.937620028396208
1985	2.890779439533608
1986	2.9628512655610875
1987	3.0776082814640344
1988	3.086376885014601
1989	3.0759025723168434
1990	2.8522776152123925
1991	2.929031624673263
1992	2.9786499428325612
1993	2.952066753524243
1994	2.984648635342887
1995	3.127021989175792
1996	2.9437784175494435
1997	2.998181518390626
1998	3.0116015037251227
1999	2.9739814934422792
2000	3.021183953801387
2001	3.1607324029947512
2002	3.2233397084204127
2003	3.2324981711978746
2004	3.0070514893925315
2005	2.99713927805254
2006	3.059863827779019
2007	3.065681109816384
2008	3.104042071461259
2009	3.1039314663723974
2010	3.1415629480576586
2011	3.1399871357786076
2012	3.2226930741405857
2013	3.1861168107674955
2014	3.2220902630971566