Year	% of total electricity output
1990	47.06611669963415
1991	47.39296962411734
1992	47.02617509810404
1993	47.15616837147154
1994	47.903047260417786
1995	45.30871660866847
1996	44.625423039398605
1997	42.97567258552297
1998	42.54951109249915
1999	42.73685374008742
2000	41.57129836565316
2001	41.3123352704426
2002	41.08636106924941
2003	42.482149491544185
2004	41.47831366810242
2005	41.79870626058308
2006	41.15295242493865
2007	40.125448286467915
2008	40.70854204401698
2009	39.98387868696679
2010	41.480757845498545
2011	41.38077809846879
2012	42.08861512733817
2013	42.57328357095514
2014	42.829952514083644
2015	42.22422029784533