Year	% of total electricity output
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0.467289719626168
1998	0.512820512820513
1999	0.467289719626168
2000	0.476190476190476
2001	0.429184549356223
2002	0.386100386100386
2003	0.36101083032491
2004	0.353356890459364
2005	0.347222222222222
2006	0.743494423791822
2007	0.694444444444444
2008	0.696864111498258
2009	0.677966101694915
2010	0.643086816720257
2011	0.593471810089021
2012	0.557103064066852
2013	0.540540540540541
2014	0.515463917525773
2015	0.492610837438424