Year	% of total fuel combustion
1990	8.30913197805744
1991	8.74306485555768
1992	2.9546400332917195
1993	3.015427769985975
1994	2.8490759753593426
1995	1.613626176602421
1996	2.7455529775715397
1997	2.5359106224507895
1998	2.25617338781311
1999	3.21936610930871
2000	2.2558139534883725
2001	3.040390590324012
2002	4.049331963001027
2003	3.9839111281363726
2004	3.403048564338887
2005	0.5449041372351159
2006	0.5604947816003095
2007	3.0508474576271185
2008	0.39313056072832553
2009	0.6130939347492884
2010	0.4795117698343499
2011	0.4995004995004995
2012	0.9858839345731569
2013	0.9903169014084511
2014	0.9446339543426922