Year	% of total electricity output
1990	24.288153208769298
1991	24.70283491082354
1992	24.946844849371637
1993	25.96208722682013
1994	26.742127717429415
1995	26.734855337634354
1996	25.918086521303785
1997	25.692196905947892
1998	26.026624187144133
1999	25.286873775856304
2000	24.63851141375148
2001	24.340920179071055
2002	23.67371372736672
2003	22.497319447364077
2004	23.149674153742456
2005	23.274989672920114
2006	22.824461175339554
2007	22.067488407282287
2008	22.43435960748419
2009	22.715216392648344
2010	22.935503571239224
2011	22.10038640945557
2012	23.040224440848903
2013	23.41927471482349
2014	24.07945891876094
2015	24.430535554756705