Year	% of total fuel combustion
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	1.6241299303944332
1981	3.041825095057035
1982	2.6711185308848084
1983	2.4502297090352223
1984	2.1186440677966103
1985	2.2757697456492645
1986	1.0922330097087378
1987	0.23041474654377903
1988	0.35671819262782434
1989	0
1990	6.989247311827955
1991	7.717041800643086
1992	7.98514391829155
1993	8.073394495412844
1994	5.372616984402079
1995	7.585644371941274
1996	1.9762845849802364
1997	2.1903323262839893
1998	1.965065502183404
1999	1.9622093023255829
2000	2.2869022869022873
2001	2.2377622377622366
2002	2.17391304347826
2003	2.4016010673782535
2004	2.2565320665083135
2005	2.2087244616234125
2006	2.27027027027027
2007	2.4831867563373002
2008	2.252010723860591
2009	2.162718846549948
2010	2.118644067796611
2011	2.3080782739588557
2012	2.1510096575943813
2013	1.0685663401602847
2014	1.9908751555371216