Year	% of total electricity output
1990	16.3760221818745
1991	20.846513373831
1992	20.5539188388093
1993	20.5797629070058
1994	21.0894465331818
1995	17.466001584065
1996	19.3080142691251
1997	18.7430027096753
1998	18.3225246890461
1999	19.7932537463115
2000	18.8481927532313
2001	19.9886720560218
2002	17.408803309168
2003	16.3708004107895
2004	18.2133837316627
2005	16.318218568926
2006	16.456444939891
2007	15.4807249320295
2008	18.5511933581478
2009	24.0189363067266
2010	25.760359871876
2011	27.5947287192996
2012	31.0203903154411
2013	38.905348564998
2014	43.3916063800716
2015	38.6792251795342