Year	% of total electricity output
1990	61.8477133970741
1991	68.5884907709012
1992	74.4770736733642
1993	74.7045582442319
1994	75.2197265625
1995	72.2419442927362
1996	70.8687440982059
1997	60.9293330545683
1998	51.1573220213943
1999	58.4659790313681
2000	54.7833289409284
2001	59.4942498693152
2002	50.8380824673148
2003	46.3921808185706
2004	38.5595879590556
2005	31.6739973162368
2006	33.8435852082059
2007	34.4943887297039
2008	35.4814976292986
2009	36.1322512774271
2010	29.1402800754455
2011	39.460181412868
2012	45.0192189944894
2013	41.6620020151295
2014	42.9814065130943
2015	36.7320576972006