Year	% of total electricity output
1990	94.9489521762493
1991	87.9042598660778
1992	89.7628947072705
1993	92.2286287290048
1994	98.7924924530778
1995	93.5468527033455
1996	87.0914542728636
1997	91.1723559037493
1998	96.122491638796
1999	77.1059216013344
2000	93.384290985767
2001	99.7945945945946
2002	99.6772514315461
2003	99.8717799277305
2004	81.584764495834
2005	87.5032543608435
2006	64.87448816094
2007	87.0570761722894
2008	60.9077431862242
2009	68.7380173677681
2010	87.6216462028195
2011	72.0417633410673
2012	61.7438897801265
2013	80.8523409363745
2014	90.7260852862082
2015	88.5589519650655