Year	% of total energy
1971	0.36734853831540476
1972	0.2071264892489304
1973	0.11195890524808368
1974	0.05246369617102416
1975	0.13187781890521744
1976	0.16849835338763325
1977	0.25568049474651344
1978	0.14797536775130773
1979	0.16550948509538455
1980	0.10003961444023317
1981	0.10382944471500136
1982	0.10626081172383066
1983	0.09126399873898396
1984	0.08329202021307136
1985	0
1986	0.9750191667641288
1987	0.9161928913247984
1988	0.8263428365745337
1989	0.8258813537659812
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
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	0.028441888822977275
2014	0.04471330139980016