Year	% of total fuel combustion
1991	6.194690265486727
1992	2.4390243902439024
1993	14.685314685314685
1994	13.939393939393941
1995	2.2346368715083798
1996	2.0833333333333335
1997	2.0304568527918785
1998	2.4752475247524752
1999	2.0202020202020203
2000	0.5263157894736843
2001	0.4115226337448559
2002	0
2003	0.8928571428571428
2004	0.4273504273504274
2005	1.6064257028112447
2006	6
2007	6.563706563706565
2008	8.21917808219178
2009	3.691275167785235
2010	0.977198697068404
2011	0.6389776357827477
2012	2.7777777777777777
2013	2.3255813953488373
2014	0.2785515320334262