Year	% of total fuel combustion
1971	41.47286821705426
1972	42.04545454545455
1973	45.038167938931295
1974	44.60966542750929
1975	43.51145038167938
1976	40.89219330855019
1977	45.714285714285715
1978	46.50349650349651
1979	51.24999999999999
1980	44.164037854889585
1981	47.49262536873155
1982	38.40304182509506
1983	52.23463687150838
1984	50.144092219020166
1985	48.61538461538461
1986	38.00000000000001
1987	42.16867469879518
1988	45.11494252873563
1989	43.939393939393945
1990	37.79264214046822
1991	62.57668711656442
1992	62.4113475177305
1993	62.04379562043795
1994	57.02479338842975
1995	55.26315789473685
1996	54.78260869565218
1997	54.78260869565218
1998	58.26771653543307
1999	59.199999999999996
2000	0
2001	0
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	0
2009	0
2010	0
2011	0
2012	0
2013	0
2014	0