Year	% of total electricity output
1990	62.5550660792952
1991	68.5774946921444
1992	78.125
1993	87.7551020408163
1994	92.6582278481013
1995	92.8921568627451
1996	94.327731092437
1997	97.2139303482587
1998	99.6066433566434
1999	99.6887159533074
2000	99.546204620462
2001	99.6297854438368
2002	99.7010698552549
2003	99.6607683139268
2004	99.6073074953048
2005	99.8419269853218
2006	99.8642871683518
2007	99.9191341129634
2008	99.9140609506181
2009	99.9233626127454
2010	99.8859954398176
2011	99.8811645870469
2012	99.8615323750495
2013	97.6569318563276
2014	91.1575743913436
2015	86.4108873600161