Year	% of total electricity output
1990	94.500518353297
1991	94.6257525269118
1992	94.4194397100922
1993	95.2547067974728
1994	95.4053399271653
1995	94.1574958000878
1996	93.5611340368994
1997	92.9778363670604
1998	92.9233437348484
1999	90.0369268275195
2000	89.4927058553782
2001	84.2874450546105
2002	85.7381730026528
2003	87.1636031278562
2004	86.0321122820058
2005	87.1246275118911
2006	86.7476516501048
2007	88.2146796451509
2008	84.2664236492775
2009	88.9957757749597
2010	84.7242338752678
2011	87.1209969967485
2012	82.4482831002635
2013	76.6892081191253
2014	73.0820738473312
2015	73.9669080481113