Year	kg per kg of oil equivalent energy use
1971	2.643219682563703
1972	2.6364753028586803
1973	2.6431453248982764
1974	2.6324389627839424
1975	2.64178335334657
1976	2.6828888303782894
1977	2.6396990604911537
1978	2.636974967123665
1979	2.693537098602604
1980	2.6007049279302223
1981	2.4992083923877524
1982	2.5181687298062294
1983	2.51564631904263
1984	2.45896794091645
1985	2.432873678147115
1986	2.37575335081332
1987	2.48413056846231
1988	2.53880721601774
1989	2.517687515678973
1990	2.167447427514091
1991	2.2179917331581573
1992	2.1497163385710913
1993	2.2169483756525277
1994	2.1362027561051082
1995	2.1058594312832497
1996	2.258433937381136
1997	2.201506565709758
1998	2.226510502293045
1999	2.205783363767851
2000	2.14290013453436
2001	2.132480691716828
2002	2.0640912727912126
2003	2.1079084583768135
2004	2.132365558560643
2005	2.1864245509297358
2006	2.1340338344835557
2007	2.2187424003191367
2008	2.1651799912903495
2009	2.084909943848465
2010	2.1373707258718952
2011	2.2007700460372637
2012	2.2087329462972063
2013	2.216491253870066
2014	2.077103907333665