Year	% of total electricity output
1990	52.4448290783211
1991	58.8752196836555
1992	54.1459369817579
1993	58.2798943794794
1994	48.1586402266289
1995	43.3256045048029
1996	45.4601605929586
1997	46.4573732718894
1998	43.288409703504
1999	47.3589281113115
2000	51.520618556701
2001	54.8492462311558
2002	53.9435946462715
2003	47.1144967682364
2004	48.7066106566438
2005	41.2581699346405
2006	41.8679245283019
2007	41.698639693059
2008	41.3787175520028
2009	39.4870119261559
2010	33.9530765825587
2011	34.196675900277
2012	32.3064874037332
2013	32.1760694358338
2014	28.0068532267276
2015	31.4024390243902