Year	% of total electricity output
1990	98.4797923618836
1991	98.5608856088561
1992	98.7212276214834
1993	98.9406779661017
1994	98.8235294117647
1995	98.850987432675
1996	98.8624612202689
1997	98.849104859335
1998	98.3585858585859
1999	98.7559241706161
2000	98.9080459770115
2001	98.1078791301892
2002	96.4242424242424
2003	95.7654723127036
2004	95.3771289537713
2005	94.2057942057942
2006	88.8170779475127
2007	74.8235742895289
2008	75.8493223024116
2009	70.6726612484869
2010	73.2157992880149
2011	75.291335922986
2012	75.3650793650794
2013	75.3357531760436
2014	75.3250975292588
2015	76.1171944362237