Year	% of total energy
1960	10.40356228935082
1961	10.10935640855926
1962	9.532017826153963
1963	9.19668158294725
1964	8.928718002077703
1965	8.592928612968054
1966	8.404883194267644
1967	8.191801161829234
1968	7.836641706833815
1969	7.4364272876630135
1970	6.946360305561152
1971	40.011811804407614
1972	39.249307082977616
1973	38.02574193088105
1974	37.40681520784875
1975	36.02875302243193
1976	35.03762673928382
1977	33.64351414101369
1978	32.27195288370155
1979	31.77738012577227
1980	31.562003365029543
1981	31.650637252020797
1982	31.0078522319602
1983	30.867886228143483
1984	30.320087779386387
1985	29.849041132831292
1986	29.275873550935643
1987	28.580975039727498
1988	27.943166890647554
1989	27.770819422551256
1990	16.751096358780295
1991	16.961316421591686
1992	17.43128606054429
1993	17.551803841699684
1994	17.813476308947376
1995	17.45512222762638
1996	17.316061749444923
1997	17.31368822721032
1998	17.428848123375715
1999	17.276036686372432
2000	16.943515372167578
2001	16.48908642887137
2002	16.15676119893623
2003	15.310611274196352
2004	14.389866208130876
2005	13.752326152433977
2006	13.222749294864022
2007	12.63711813518393
2008	12.255544157041165
2009	12.03418532662521
2010	11.358678158946772
2011	10.892690133129717
2012	10.581427952077458
2013	10.469890934363347
2014	10.283218620104591
2015	4.504159279122867