Year	% of total fuel combustion
1971	12.280701754385968
1972	14.285714285714285
1973	11.428571428571429
1974	13.432835820895523
1975	11.428571428571429
1976	10.256410256410255
1977	23.21428571428571
1978	30
1979	17.77777777777778
1980	8.888888888888888
1981	6.870229007633586
1982	4.580152671755725
1983	4.8
1984	4.285714285714286
1985	3.5211267605633805
1986	4.081632653061225
1987	4.3478260869565215
1988	4.891304347826086
1989	1.092896174863388
1990	1.5544041450777202
1991	1.5957446808510638
1992	1.7777777777777777
1993	1.1494252873563218
1994	0
1995	3.151862464183381
1996	0.5797101449275363
1997	0.5221932114882507
1998	0.49751243781094534
1999	0.49627791563275436
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