Year	kg per kg of oil equivalent energy use
1960	2.887117770742103
1961	2.7580540294757365
1962	2.5211410021619702
1963	2.5102709224566135
1964	2.3294056254351245
1965	2.3254334287785605
1966	2.290928688208658
1967	2.287946436059052
1968	2.1160850994929294
1969	2.167917085468736
1970	2.054802077592862
1971	2.2058281649233584
1972	2.1312097909808636
1973	2.309106369030275
1974	2.151991848530067
1975	2.1365606115576954
1976	2.1117141069409526
1977	2.1296185330466497
1978	1.9030876737795326
1979	1.8696339106683475
1980	1.94311650360307
1981	1.8557508937875034
1982	1.918098598636547
1983	1.8250297608344372
1984	1.8392077656429018
1985	1.9472940547734512
1986	2.035755740409826
1987	2.132470593375546
1988	2.142894737397196
1989	2.001843699394892
1990	1.7383149549315942
1991	1.7187501425323537
1992	1.8133291064450952
1993	1.686887921078197
1994	1.6539705579616544
1995	1.6372495631035133
1996	1.653935256801663
1997	1.7275600536698634
1998	1.721516551556776
1999	1.7377520860288362
2000	1.7261061561137216
2001	1.854562431137238
2002	1.8439640860258877
2003	1.978165641794665
2004	1.8967599393221475
2005	2.023756754125723
2006	2.0258133853301943
2007	1.949738213047118
2008	1.9762431083768386
2009	1.7871087832288401
2010	1.6934935520763412
2011	1.6573758961297678
2012	1.6663490313545877
2013	1.63922449966867
2014	1.545924560632095
2015	1.5758844927091231