Year	% of total electricity output
1990	7.241521245943695
1991	6.69071124370349
1992	5.769018132580058
1993	5.387481870789844
1994	5.320985081960581
1995	5.081062818457626
1996	5.300068346272899
1997	5.171465027730857
1998	4.809929674095664
1999	4.846387134445392
2000	4.46423746968679
2001	4.617561633524201
2002	3.7555486312519597
2003	3.943509657772641
2004	3.9135300966289424
2005	4.474439921798135
2006	4.11949398886756
2007	4.150216714750711
2008	3.3627390498516823
2009	3.328485767385286
2010	3.854009912466847
2011	3.5497656350935216
2012	3.4812185223175915
2013	3.7703849612486824
2014	3.2780734203655015
2015	2.9207016861051316