Year	% of total electricity output
1990	99.3540051679587
1991	99.400479616307
1992	99.4413407821229
1993	99.4106090373281
1994	99.526963103122
1995	99.5442114858706
1996	99.5726495726496
1997	99.6025437201908
1998	99.5134201852143
1999	99.5517640254482
2000	99.608140563772
2001	99.6170948616601
2002	99.6451465201465
2003	99.6559760292975
2004	99.8867263927505
2005	96.3849016480595
2006	76.6707920792079
2007	72.2990271377368
2008	70.8343492465987
2009	59.6059339548983
2010	54.8434382507431
2011	61.1123705886798
2012	87.0001719099192
2013	96.267673662949
2014	91.3589635262639
2015	92.9505269826643