Year	% of total fuel combustion
1960	0.8547008547008548
1961	0.8695652173913043
1962	0.8064516129032258
1963	0.7874015748031495
1964	0.7751937984496123
1965	1.4285714285714286
1966	2
1967	1.4084507042253522
1968	2.013422818791946
1969	2.2556390977443606
1970	2.2727272727272725
1971	47.61431411530815
1972	48.861646234676016
1973	45.80965909090909
1974	45.55010511562718
1975	46.19076184763047
1976	44.56906729634002
1977	45.99786552828176
1978	45.84819154355578
1979	46.830357142857146
1980	51.64377861007074
1981	49.58647968356706
1982	49.46935980828483
1983	49.68280467445742
1984	58.42839036755387
1985	59.86903648269409
1986	60.42688203057398
1987	60.660830273933925
1988	63.39572192513369
1989	64.20072426280393
1990	69.56983536909188
1991	68.36871808653589
1992	69.55523672883787
1993	68.08795127024216
1994	68.02052785923755
1995	66.3233779608651
1996	65.84165377584024
1997	66.24846583935634
1998	66.08799363901404
1999	67.99792531120332
2000	66.0342797330891
2001	64.89522847765716
2002	63.786303334528505
2003	66.33210661313706
2004	64.53985076240943
2005	65.3609678698929
2006	64.68707172224761
2007	64.32949869846334
2008	62.95788284653865
2009	63.33925112976114
2010	65.8278439789801
2011	68.41655996585575
2012	66.62185777658287
2013	66.10311673227075
2014	64.90111248454883