Year	% of total electricity output
1990	98.1818181818182
1991	98.5294117647059
1992	98.1308411214953
1993	98.1981981981982
1994	98.2905982905983
1995	98.3333333333333
1996	98.3333333333333
1997	98.3606557377049
1998	98.2142857142857
1999	98
2000	98.019801980198
2001	98.2905982905983
2002	98.4532095901005
2003	98.0676328502416
2004	97.8632478632479
2005	98.0449657869013
2006	97.9013641133263
2007	98.3257854159168
2008	98.2423608608917
2009	96.3936374817371
2010	87.6533996099443
2011	90.8573088394698
2012	97.9618194008257
2013	87.02056925233
2014	80.7187888270213
2015	82.7093851288663