Year	kg per kg of oil equivalent energy use
1960	1.5735021773423372
1961	1.6003260700157431
1962	1.824880771646109
1963	1.8209319758097944
1964	2.0068482978430437
1965	1.9831323687322107
1966	2.079713766441332
1967	2.1328516286322694
1968	2.1974667800346968
1969	2.227591524560191
1970	2.341257631278414
1971	2.1211232148776067
1972	2.1100019942414896
1973	2.148656293501466
1974	2.1381419239799695
1975	2.1714079016209795
1976	2.2114943657196475
1977	2.220225529579008
1978	2.256718760882346
1979	2.2653910014992036
1980	2.216670735236316
1981	2.185104744478999
1982	2.232784662568607
1983	2.267759078791823
1984	2.285199383310242
1985	2.3497091084524353
1986	2.3745008900682616
1987	2.4071298127747336
1988	2.4557994189854346
1989	2.4622015264268406
1990	2.2825089753804177
1991	2.321709222249941
1992	2.3443188641838955
1993	2.341314148172045
1994	2.3447965554787946
1995	2.378064436584362
1996	2.3563288992601463
1997	2.3633907462679384
1998	2.388672851544825
1999	2.336189926985534
2000	2.3734836695213
2001	2.3890870747242396
2002	2.4065996889052594
2003	2.4378845058281513
2004	2.4743170196077306
2005	2.517907593847126
2006	2.5566391007452505
2007	2.59034400309576
2008	2.593072346868983
2009	2.5953307744916603
2010	2.6090661991093413
2011	2.665039807456091
2012	2.652537626748513
2013	2.6659826425162194
2014	2.6501046829330877
2015	2.599867802882943