Year	% of total energy
1990	0.1945625747594077
1991	0.1831040850168132
1992	0.3538229461746087
1993	0.650206564641643
1994	1.0098987779949136
1995	0.8290674010211484
1996	0.7535442576008534
1997	0.7131129094544797
1998	0.6938823078995954
1999	0.7137317271915099
2000	0.6080611535788742
2001	0.44646752204293166
2002	0.5230822360952857
2003	0.6026598802655135
2004	0.600786249465928
2005	0.32886095176228397
2006	0.5254456556150067
2007	0.29882440201819516
2008	0.28298284759770825
2009	0.3247930052835857
2010	0.34044767217796706
2011	0.3113160856218662
2012	0.2853638987232516
2013	0.2931014449580587
2014	1.1452852042711439