Year	% of total electricity output
1990	99.5524296675192
1991	99.7442455242967
1992	99.9360613810742
1993	99.9406175771972
1994	99.9406880189798
1995	100
1996	100
1997	100
1998	100
1999	100
2000	100
2001	99.9781489754297
2002	99.9586534660663
2003	99.9169665098256
2004	99.923560387294
2005	99.943342776204
2006	99.9601840382233
2007	99.9695214873514
2008	99.9985634454325
2009	99.998571040711
2010	99.9959062811293
2011	99.9957552175451
2012	99.997070326805
2013	99.9934556173054
2014	99.9928610794619
2015	99.9935464335397