Year	% of total electricity output
1990	92.8593508500773
1991	95.3407105416424
1992	95.7130358705162
1993	96.3772123893805
1994	94.263862332696
1995	89.8313370813982
1996	90.5029239766082
1997	83.4335337341349
1998	81.9835426591598
1999	66.3806728381124
2000	46.9795307039441
2001	66.5928223305272
2002	78.0167778016778
2003	83.6141195346972
2004	74.9860309182343
2005	71.6623600344531
2006	70.3408728894552
2007	71.6005556413027
2008	63.1306990881459
2009	55.2915129151291
2010	69.0695158236408
2011	66.8729851708575
2012	74.7765397330721
2013	69.2879675529518
2014	81.4862821343703
2015	87.5142472282665