Year	% of total electricity output
1990	99.8412698412698
1991	92.2712466686408
1992	81.9209039548023
1993	95.4008544860518
1994	93.2072031000684
1995	92.7113702623907
1996	71.7880794701987
1997	66.997084548105
1998	68.8896709484427
1999	67.480595084088
2000	45.8023986293547
2001	46.0109128447132
2002	38.1825878368844
2003	42.8978745463971
2004	36.1384335154827
2005	37.2265122265122
2006	49
2007	40.0666599333401
2008	41.5392303848076
2009	39.2950130182255
2010	53.1154522729377
2011	40.847486704409
2012	29.2412402319133
2013	59.8769026033436
2014	39.2023112109783
2015	48.4751934456076