Year	% of total electricity output
1990	33.0935251798561
1991	33.0935251798561
1992	33.0935251798561
1993	33.0935251798561
1994	62.4223602484472
1995	55.3367217280813
1996	53.6100056850483
1997	43.6923076923077
1998	39.9724011039558
1999	55.0586191923578
2000	47.071217867678
2001	34.6483066617045
2002	32.2703639514731
2003	29.2322215229704
2004	24.3680188124633
2005	28.8830715532286
2006	32.5567502986858
2007	38.8159813356664
2008	38.5470085470086
2009	39.1853126792886
2010	37.9785183145139
2011	37.9432624113475
2012	37.327311370882
2013	35.7719475277497
2014	34.5306513409962
2015	34.5306513409962