Year	% of total electricity output
1990	4.8984468339307
1991	4.99665103817816
1992	5.20912547528517
1993	4.83002043470184
1994	5.57998573805562
1995	4.14110429447853
1996	4.03276955602537
1997	4.10889329066992
1998	5.60398505603985
1999	5.16425453710085
2000	5.00570269927766
2001	4.16937317310815
2002	5.5629352332649
2003	4.57745062547766
2004	5.52845528455285
2005	7.30898306407555
2006	9.12745242661159
2007	10.0333967752361
2008	11.9967901564799
2009	14.6934687745905
2010	13.2311186825667
2011	19.9639228390517
2012	19.365535536642
2013	22.0058651026393
2014	24.7597644141352
2015	27.9654080216378