Year	% of total electricity output
1990	99.8861047835991
1991	96.5665236051502
1992	94.6952595936795
1993	93.3547695605573
1994	91.980198019802
1995	96.9063545150502
1996	96.7239967239967
1997	90.846877673225
1998	90.48
1999	95.4668470906631
2000	98.372513562387
2001	99.0358864488484
2002	99.8115873763542
2003	99.823555359506
2004	99.4210090984284
2005	99.3683379392025
2006	99.5269286754003
2007	99.6776504297994
2008	99.6799431009957
2009	99.5826645264847
2010	99.9064837905237
2011	99.942726231386
2012	99.4650900900901
2013	99.7156667614444
2014	99.9736634184883
2015	100