Year	kg per kg of oil equivalent energy use
1960	3.6299816160012117
1961	3.60818587540445
1962	3.5848994274048285
1963	3.744670327365953
1964	3.79033850481872
1965	3.7123542969572147
1966	3.676549666911764
1967	3.6376995686607887
1968	3.6826921045697243
1969	3.649743120897981
1970	3.608100159916112
1971	2.545245033195898
1972	2.5443554797371157
1973	2.5600711692969007
1974	2.5370170248923856
1975	2.5963055287865577
1976	2.6193748439042213
1977	2.6077689985659718
1978	2.624826036315471
1979	2.613046910644256
1980	2.589307527170581
1981	2.5449113748178998
1982	2.593103873739845
1983	2.62295521510141
1984	2.656039541028924
1985	2.7444613872004107
1986	2.768130822011486
1987	2.804043721217686
1988	2.8303707369667284
1989	2.832608877277118
1990	2.501832396116625
1991	2.585466055164816
1992	2.602758899682232
1993	2.6071912750614428
1994	2.624174707408128
1995	2.6769202506435787
1996	2.626409776539913
1997	2.63055306742981
1998	2.6679211845561026
1999	2.5998185715256183
2000	2.6425357790733397
2001	2.655605411156313
2002	2.673194229249906
2003	2.6986708366643604
2004	2.7438033343728434
2005	2.8036012716367926
2006	2.829874292193189
2007	2.8432353557979155
2008	2.8422881013889714
2009	2.8514987852751035
2010	2.8468230322221477
2011	2.8981886051727352
2012	2.870060885985164
2013	2.8883996410937542
2014	2.855611946129029
2015	2.660704706646589