Year	% of total electricity output
1990	3.1602817716877363
1991	2.4302213666987496
1992	2.3727944875238465
1993	2.6352382897206263
1994	2.8253073984602914
1995	3.2054729043436723
1996	3.5221790547752194
1997	3.4628569904091138
1998	2.950568578579039
1999	2.870737352365628
2000	8.666853367589553
2001	8.111429696713616
2002	7.503329706109341
2003	6.436429524329573
2004	6.494614756766371
2005	5.763818571279026
2006	7.427941464694365
2007	8.15685914745177
2008	9.732251718224333
2009	9.791246880885025
2010	9.290895206705208
2011	9.13645551569962
2012	9.400621209386932
2013	9.249508368272494
2014	9.269233533041605
2015	8.91477955359129