Year	% of total electricity output
1990	62.3787188226728
1991	61.4104129913602
1992	61.6792144214931
1993	61.7223279842591
1994	60.4004513445858
1995	61.0040981776948
1996	63.1060742256021
1997	62.3509414225941
1998	60.4060543150615
1999	61.1837048424289
2000	60.6003011908929
2001	58.0326562447014
2002	59.8864192109229
2003	58.915564963989
2004	58.4463170880115
2005	60.0294267425595
2006	59.5442882203545
2007	60.2962722574056
2008	61.472527402962
2009	62.8503473332841
2010	61.396756842691
2011	62.3382501312229
2012	63.230561170877
2013	63.2980330554908
2014	62.8249922157553
2015	63.011450040254