Year	kg per kg of oil equivalent energy use
1971	3.0518993397888496
1972	2.9602912580189846
1973	2.9315813142634406
1974	3.058669324808946
1975	3.0364140926773913
1976	3.0962635825169467
1977	3.111755669176194
1978	3.128487279958868
1979	3.507104530650597
1980	3.599831921335729
1981	3.623857117181152
1982	3.4567531089265113
1983	3.4075659669795413
1984	3.5787291824510343
1985	3.4974526780465895
1986	3.3897116250234953
1987	3.4462630521290407
1988	3.1748510900820874
1989	3.212896860056047