Year	kg per kg of oil equivalent energy use
1971	42.40884806977361
1972	53.92308963756263
1973	28.978379963361775
1974	13.782835665065775
1975	9.564222048433129
1976	6.171838650097471
1977	6.059652334415405
1978	9.673244902593716
1979	7.250743313105602
1980	5.099674294613711
1981	1.131541909543872
1982	1.4986865913502556
1983	1.8339137488335784
1984	1.127898934699941
1985	1.456725549462727
1986	1.4689112964279758
1987	2.066607632032392
1988	4.2825756043478584
1989	4.095102645671954
1990	2.269979292229722
1991	1.7309180369341037
1992	1.7097924912009983
1993	1.9146709808607114
1994	2.2075325917659034
1995	2.002665770659166
1996	2.082279667401138
1997	2.1788413529534645
1998	1.852765736472231
1999	1.7665282113290532
2000	1.8578271558134054
2001	1.9522164450908552
2002	2.0209642595251847
2003	2.095862766898143
2004	2.1421947045991874
2005	2.173217127836567
2006	2.290957286973496
2007	2.11946073977856
2008	2.0380108788004527
2009	2.441825078562353
2010	2.117065709892869
2011	1.8100201787556305
2012	1.861596440356069
2013	2.307572453501758
2014	1.9611909296748447