Year	% of total electricity output
1990	24.39627539144468
1991	24.758247919108065
1992	25.10428725106969
1993	26.213621360847238
1994	27.258523198735613
1995	27.651209349700753
1996	26.406170598986005
1997	26.465228727621312
1998	26.855727068783075
1999	26.00357819513188
2000	25.566214247746007
2001	25.525281374380654
2002	24.735780545477652
2003	22.93210894050931
2004	23.54134491166502
2005	23.22898806723558
2006	22.334957157846212
2007	21.971044874281937
2008	22.796423713152304
2009	23.418335437865316
2010	23.35509217166229
2011	22.211016694243295
2012	23.832337766068747
2013	23.929322016157073
2014	25.254613832081652
2015	25.79831246253808