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	51.33587786259542
1972	51.37135393992164
1973	45.84681769147788
1974	46.85522887979159
1975	42.66294876263506
1976	44.98587570621469
1977	45.27284263959391
1978	44.26330359889264
1979	45.13023782559456
1980	49.18787222523011
1981	48.85624849506381
1982	49.04306220095694
1983	48.93162393162393
1984	55.34114403859408
1985	57.36344779903204
1986	57.730836236933804
1987	58.31218274111675
1988	59.89197839567915
1989	59.16270218839201
1990	65.3659075834623
1991	64.68023255813954
1992	66.92316660837122
1993	67.0109283055122
1994	65.9400544959128
1995	65.61391057487579
1996	64.70521670250085
1997	65.0656455142232
1998	64.91525423728814
1999	66.23417064563007
2000	63.57128247085294
2001	62.74318115162771
2002	62.38634254963815
2003	65.46453718014769
2004	62.997579904865226
2005	63.402655206814515
2006	62.52022796031802
2007	61.110027945668406
2008	60.252889711986725
2009	61.74106267564212
2010	64.32442196531792
2011	66.91484411354119
2012	65.0639955481358
2013	64.56920036322846
2014	63.243549466961944