Year	% of total fuel combustion
1971	4.990019960079842
1972	4.704837993786063
1973	4.639922667955532
1974	4.526046114432111
1975	3.7935080172076625
1976	3.6193029490616606
1977	3.87621131603626
1978	3.885853066180934
1979	4.760594386351126
1980	5.303216302479744
1981	6.865479510834584
1982	7.38974970202622
1983	7.496891099662463
1984	7.7234455958549235
1985	6.252909231962763
1986	5.451499923861734
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0.32526671870934165
1995	0.45315370483772316
1996	0.5106778087279474
1997	0.8384392131570453
1998	0.24492295132156364
1999	0.4202501954652069
2000	0.23066893992578344
2001	0.1706024961838911
2002	0.1679780744408094
2003	0.11923011412025106
2004	1.787386824851702
2005	3.76849675010372
2006	3.746795503845396
2007	3.790657862558082
2008	3.7752414398595264
2009	4.041735939918592
2010	4.041950113378684
2011	3.985983355234342
2012	3.782555866659623
2013	3.61266720018292
2014	3.4858890748542737