Year	% of total energy
1971	0.18024463288325263
1972	0.054383956052795314
1973	0.33022272253842677
1974	0.11878960265083433
1975	0.12484544744565168
1976	0.1150794954421153
1977	0.009692581856224245
1978	0.008890275041676183
1979	0.028220857601464918
1980	0.03518362061840523
1981	0.03571519780713735
1982	0.032081604156966446
1983	0.01207926031241188
1984	0.04670547440540002
1985	0.04195404474418476
1986	0.038749351351661
1987	0.035610201835719515
1988	0.029170617628966593
1989	0.02497350622892714
1990	0.06460502889496968
1991	0.2186430237457098
1992	0.09171308990149571
1993	0.029903460118150378
1994	0.015295759131228603
1995	0.04476075407369509
1996	0.025283233394215652
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
2014	0