Year	% of total electricity output
1990	61.178247734138964
1991	60.357675111773474
1992	43.906618119511656
1993	41.989664082687334
1994	43.080020130850535
1995	39.27875299760192
1996	35.38271044992745
1997	38.26885721393301
1998	38.56511426968265
1999	38.354875076002656
2000	36.233955390970486
2001	38.775000036012976
2002	36.77172276603475
2003	27.72661243576588
2004	28.907434631617715
2005	26.922100119027416
2006	27.20430229301039
2007	39.01755590943871
2008	40.34843592399443
2009	37.363271303369544
2010	32.79349701199665
2011	36.15390031747438
2012	41.11567002934328
2013	39.669547500818275
2014	30.854074757134978
2015	30.301562480135267