Year	% of total electricity output
1990	0.789563534968417
1991	0.752957042115023
1992	0.864024646408066
1993	0.723582805274876
1994	0.841031104133668
1995	0.908645736982426
1996	0.746626207777689
1997	0.755191944619257
1998	0.924763935424916
1999	1.01960031667586
2000	1.26128085245189
2001	1.36737133989672
2002	1.40599710893389
2003	1.42650279436579
2004	1.77468495489194
2005	2.457151524344
2006	3.49978659837815
2007	3.98272552783109
2008	5.2857638515009
2009	6.05638821459591
2010	6.92080611298797
2011	9.41087918754353
2012	12.8128790384827
2013	14.2093861058371
2014	17.0806411009482
2015	20.8000230056939