Year	% of total electricity output
1990	63.2343234323432
1991	62.4924744130042
1992	66.6462668298654
1993	64.7093712930012
1994	60.3336921420883
1995	52.1459227467811
1996	52.0601066408144
1997	49.0232558139535
1998	53.0518819938962
1999	49.9380932728023
2000	46.0490463215259
2001	44.6478873239437
2002	41.6100872938894
2003	34.6750149075731
2004	31.9296221517162
2005	32.9587036069002
2006	30.3030303030303
2007	28.8986257717586
2008	26.5710134398838
2009	49.7303959328301
2010	82.7043605814109
2011	76.4872856298048
2012	70.1462484103434
2013	80.853753403345
2014	78.3491561181435
2015	64.5359086380011