Year	% of total energy
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0.3124011439813249
1990	0.14710289921565745
1991	0.14229792818969125
1992	0.24170693901321175
1993	0.24366746390311356
1994	0.3450646559602036
1995	0.36468594145642846
1996	0.35264157131723806
1997	0.36344506482028516
1998	0.30986975696743285
1999	0.23991762740282135
2000	0.24163941022796878
2001	0.20287208360447503
2002	0.22052301832114124
2003	0.23488583897353757
2004	0.2515339868536188
2005	0.3209760147759246
2006	0.3971130132430073
2007	0.505780748818804
2008	1.0429664270290728
2009	1.2653366974902345
2010	1.4920586686395165
2011	1.5311363235500748
2012	1.5669853600377748
2013	2.04173084095317
2014	2.4748050832180586
2015	2.7940900844343015