Year	% of total electricity output
1990	66.2021259331386
1991	65.0624738446822
1992	72.3963235146879
1993	74.067080648615
1994	70.8027096006601
1995	70.5063612309254
1996	66.8047933699182
1997	67.9159558229326
1998	69.810409586836
1999	70.6789505307431
2000	72.5440090857467
2001	69.1568277465734
2002	69.0129476493263
2003	60.7828287174897
2004	64.2022341318525
2005	63.6267774900368
2006	65.5155251581415
2007	68.6870289567632
2008	69.2308884377567
2009	71.1396947946197
2010	66.2113227544381
2011	65.6314234326824
2012	74.5291806141755
2013	78.0247869868319
2014	81.0568683458842
2015	76.4907792691417