Year	% of total energy
1960	54.994828279902826
1961	54.838206026885075
1962	50.13486057208687
1963	46.89303911469657
1964	44.91927730462725
1965	42.5090200559124
1966	39.177557455789305
1967	38.02604564636631
1968	36.11291959246811
1969	34.08936710412753
1970	32.79012777077308
1971	15.983332078570168
1972	15.832127503646854
1973	15.159836382736252
1974	14.846129812840946
1975	14.293657055412488
1976	13.74634261905747
1977	12.950186297718123
1978	13.052609504885677
1979	13.691608921578656
1980	13.11646779329038
1981	13.555611916383851
1982	13.208937624295993
1983	12.86792943520403
1984	12.363468968021252
1985	11.741872090841378
1986	11.386147184908433
1987	10.5426383117702
1988	10.411866544025889
1989	10.2865685689762
1990	1.4275240714849116
1991	1.3905703381085055
1992	1.496844461162801
1993	1.6163836985029658
1994	1.4693683755901916
1995	1.4469750181198853
1996	1.4452745494805628
1997	1.429323158946807
1998	1.391421089986493
1999	1.4746566679209525
2000	1.374280632151906
2001	1.334957596046203
2002	1.2811649423738196
2003	1.2126702937522285
2004	1.167263786224728
2005	1.1445707894558317
2006	1.1234534347279443
2007	1.1902216522118736
2008	1.1299096941991724
2009	1.1821982195668728
2010	1.1195512688862808
2011	1.0238402042817853
2012	1.034120145633996
2013	1.0795344474308057
2014	1.1875978541330516
2015	2.2629691282892708