Year	% of total electricity output
1990	24.447151037404947
1991	24.468472176749007
1992	24.646644145152425
1993	25.70067955682713
1994	26.448631385761452
1995	26.43659576553492
1996	25.576892250570857
1997	25.193629729151283
1998	25.569236536366454
1999	24.82927532577001
2000	24.123366612429752
2001	23.821481468277774
2002	23.13549317459089
2003	22.067846794638744
2004	22.637258081254767
2005	22.619155825667118
2006	22.21298046648246
2007	21.51560108181922
2008	21.869693863863613
2009	22.103005574050833
2010	22.427053809713566
2011	21.62198671901708
2012	22.62319826431753
2013	22.946386733406143
2014	23.47973185643
2015	23.911787346339427