Year	% of total electricity output
1990	62.3438579929536
1991	70.3254022135561
1992	70.0934163701068
1993	68.429852123029
1994	72.0068519116553
1995	70.0514663834654
1996	71.237498015558
1997	73.359380003843
1998	71.5964994684928
1999	75.1646552472619
2000	73.7484021531353
2001	67.0679878826884
2002	64.8151373949397
2003	65.8357260941443
2004	71.1045945287767
2005	73.2834206331132
2006	73.8983173642933
2007	72.7222582170312
2008	72.7939512309614
2009	71.8866031108881
2010	67.4900013185075
2011	70.9302227007231
2012	67.411407856773
2013	67.8345241961676
2014	68.2627042346144
2015	63.6950420954163