Year	kg per kg of oil equivalent energy use
1960	3.2448436577201165
1961	3.233071805126303
1962	3.2130066769591523
1963	3.2631770684146404
1964	3.2281477267658807
1965	3.223249451606142
1966	3.209762328262094
1967	3.1589799744401508
1968	3.1207317744876364
1969	3.061300255888217
1970	2.985397231663289
1974	2.9821979249167114
1975	2.948752791447626
1976	2.982109176365841
1977	2.9539811069169866
1978	2.91955236576836
1979	2.921110949802403
1980	2.9154492383626764
1981	2.821171765804204
1982	2.7948446654841486
1983	2.7245675223697923
1984	2.665037549576948
1985	2.618216448534307
1986	2.5417723873589946
1987	2.527370887553808
1988	2.465782080191723
1989	2.5007080324794417
1990	2.4757352067738507
1991	2.4563866945310813
1992	2.4414705380848716
1993	2.4056810190274764
1994	2.4113525382977774
1995	2.367210109886398
1996	2.3562276635985673
1997	2.3264613665144447
1998	2.3091593910392043
1999	2.29480659372709
2000	2.2841297088505224
2001	2.261794263137849
2002	2.253718739150569
2003	2.2655532026549356
2004	2.2409042988732044
2005	2.2215623120246497
2006	2.2114993839724773
2007	2.2177207862199984
2008	2.1738719091778216
2009	2.136887636916373
2010	2.1118037571204007
2011	2.1202771600499486
2012	2.106655640565
2013	2.0794708601014693
2014	2.048992418502871
2015	2.0510427024409634