Year	% of total electricity output
1990	18.6027491408935
1991	17.9509933774834
1992	28.7066246056782
1993	29.4117647058824
1994	28.955223880597
1995	36.1031518624642
1996	35.2238805970149
1997	35.1744186046512
1998	46.906301508812
1999	34.5367123287671
2000	33.3333333333333
2001	24.0282685512367
2002	22.680412371134
2003	26.0051495016611
2004	28.0191290824261
2005	28.5123613312203
2006	30.4581430745814
2007	32.4231441048035
2008	29.7917184788544
2009	29.1068770265034
2010	34.2044129754249
2011	29.9856601521785
2012	28.0248994435529
2013	27.1611906201707
2014	31.7171268879242
2015	32.0120973923708