Year	% of total electricity output
1990	35.4414662987781
1991	30.4365663987468
1992	34.8705284443729
1993	38.9340002598415
1994	42.6015781233044
1995	40.2133850630456
1996	33.3998220589501
1997	39.3869816592437
1998	36.3900448575907
1999	27.2944188300794
2000	33.159374648521
2001	41.8298840370637
2002	43.5638757652185
2003	37.9517548625448
2004	31.63480257575
2005	33.5251348456266
2006	37.127698397103
2007	29.8422008099427
2008	26.3437057991513
2009	28.9274026197721
2010	28.5854562001549
2011	32.305970437266
2012	29.2611353196635
2013	31.4844907174391
2014	31.5762041956827
2015	28.1400691239471