Year	kg per kg of oil equivalent energy use
1971	2.7323037323037327
1972	2.995670288375133
1973	2.9714275648252535
1974	2.7162004867553176
1975	2.8161658826917537
1976	2.8222165212929706
1977	2.9246866691986333
1978	2.752567951959545
1979	2.672506777832843
1980	2.7105238843204287
1981	1.9156684950931007
1982	0.6943979801167744
1983	1.0996491438510212
1984	1.020785005103461
1985	1.2119309262166404
1986	0.9270955434507804
1987	0.9615935451336358
1988	1.2096006944444444
1989	1.2567053263830017