Year	% of total electricity output
1990	85.2686959789553
1991	74.4086021505376
1992	66.724078539442
1993	74.2612011439466
1994	71.9726271942874
1995	69.1389599317988
1996	79.0010460251046
1997	72.1797087138978
1998	51.6105941302792
1999	68.8646288209607
2000	70.4317577245754
2001	49.2193598750976
2002	64.5947477800869
2003	51.0043041606887
2004	66.0128449921889
2005	64.3041015960185
2006	60.1769911504425
2007	57.6982651796778
2008	62.0700389105058
2009	56.6883586406363
2010	57.1041582012732
2011	52.6847353618001
2012	62.9315355108683
2013	57.9258763116767
2014	55.7984279099817
2015	65.3263403263403