Year	% of total energy
1990	0.6281130316370394
1991	0.7551130997087925
1992	0.9107731266201204
1993	1.0215139742829564
1994	1.2198557816425144
1995	1.3093888423657172
1996	1.5205616642774054
1997	1.5750659765235957
1998	1.646702774347147
1999	1.8663380001412242
2000	2.0658475240319496
2001	1.9740418202376555
2002	2.24020322960371
2003	2.395064160732031
2004	2.2046843525803035
2005	1.859842244548115
2006	2.2480840360099674
2007	1.8947256942831034
2008	2.1195093199492474
2009	2.2056785554434324
2010	4.807830885424285
2011	6.130717040817952
2012	6.534627894346208
2013	8.591704969597625
2014	8.329096687684213