Year	% of total electricity output
1990	15.3381410374883
1991	15.6941403137911
1992	17.0465565967574
1993	18.1499044681292
1994	20.0071781190813
1995	20.4266227099063
1996	18.1270578113514
1997	18.8005146584027
1998	19.1911293904906
1999	18.9924374251047
2000	18.729605644473
2001	19.5670238257211
2002	18.2608578316721
2003	17.0766945778758
2004	18.9562374651174
2005	18.2025297558032
2006	17.4938246140069
2007	17.5206409321501
2008	15.9141050296072
2009	17.6440464827356
2010	16.1205888143799
2011	15.8030239287522
2012	15.5637311058596
2013	17.1746302202462
2014	16.5682511980707
2015	15.8557951545716